Only really to expand on Gráinne's comment as regards the 'collecting' and 'roster development' sections - which are, as said 'distinct' although they are intrinsically linked - I would like to point you in the direction of the in-game Achievements > Battle Pets > Collect tab. There are a series of achievements called Raiding With Leashes, pretty much all of which can be completed via the auction house - if you have the gold/inclination - or by completing old raids.
Swim Speed Potions (used especially at lvl 37 for Faldir's Cove in Arathi Highlands and lvl 57 in WPL). Try to get multiple stacks of these. I also recommend keeping a stack of these always in your bags. You will frequently pass rivers and lakes and can use these potions to pass them faster through out the guide. Please note that these potions do not stack with Druid's Aquatic Form and Glyph of Aquatic Form.
Unlike many other classes, writing a demon hunter carries with it a necessity for a call to action for the character in question. For those writing a night elven demon hunter, this call to action is wildly different and varies heavily from each individual whereas those who are writing blood elven demon hunters have only one true avenue for their path: those sent to Illidan Stormrage by Kael’thas Sunstrider to train to become demon hunters.
Escort quests can take awhile to do. I have thoroughly tested all the escort quests in the game for time/xp. Most are worth doing, but as long as you are able to actually do them without failing. Most require you to pay special attention to the escortee as most are fragile and will die easily, so do your best to keep mobs off of the escortee during escort quests. The longest one in the game is the Tanaris chicken escort. The chicken escorts are only worth doing if you were able to do all 3 of them, as if you do, you will be able to turn in an additional easy quick XP turn in quest at BB, which makes them worth it.
I'm not all that hardcore on "Classic", I want to relive the old zones and the old world and it seems like most people I'm taking to is feeling the same. We would prefer to have quality of life improvements regardless of them actually being in the game at in 1.12.2 or not. Like the "Automatic Quest Tracking" to actually track it properly without you having to actually trigger progress in the quest for it to show up would make perfect sense. It's no real need to make such a thing behave nonsensical just because it's "authentic".
Unlike their night elven brothers-in-arms, the blood elven demon hunters have only one true avenue to their becoming what they are: the Sunfury. What this means for the character is that they were part of the coalition of elves to follow Kael’thas Sunstrider away from Quel’thalas in the wake of the Sunwell’s destruction. These same elves were present (and survived) the attacks on Northrend by Illidan Stormrage, Kael’thas, and Lady Vashj as well as the conquering of Outland through shackling Magtheridon. The Sunfury elves who had either proven themselves capable enough, sworn vendetta against the Burning Legion, and remained loyal to the Illidari in the wake of Kael’thas’ betrayal would prove capable of becoming demon hunters in the footsteps of Varedis Felsoul, the first blood elven demon hunter.
Within the context of Classic, the method most frequently proposed is to re-tune bosses to make them harder. Rather than copying the numbers, re-create the relative difficulty. Kind of like, when you first start working out, you use small weights. When you get stronger, you lift bigger weights. The WoW community is more knowledgeable, more experienced, has better hardware, etc. We're "stronger." So give us tougher bosses. There are a lot of forms that could take. Bosses were constantly re-tuned during vanilla anyway, so if Ragnaros does 10% more damage or something, is that really a problem? I don't think it is. What about resistance gear? back in the day, collecting resist gear was a thing people did. But the numbers and strategies are so well known today that only the tank really needs it anymore. Bosses could be re-tuned with more resistible elemental damage so that's important for entire raids to gear appropriately. That would be entirely keeping with the spirit of vanilla even if the actually numbers sitting in a database somewhere were different than they were ~13 years ago. If you want to go a little farther, a few people have proposed adding new abilities to old bosses, adjusting their timing, etc.
Learned this today: posted a comment, came back later to see if there was any feedback, reloaded the page: the page posted a copy of my comment. That was not what I wanted. I just wanted to check if my comment was posted and if there were some responses. I did not want to post a copy of my comment from 5 hours ago. And, a humble guess, I think the majority of the users are not expecting such behavior either.
Thanks so much for the replies. I think I am somewhat of a collector/roster builder. I go around doing the dailies but I also like buying pets just for their looks. I watched hazelnutty on youtube last night. I think I will focus on doing the expeditions when I have time to get all the pets that come from that. Then I will go back and do old raids like Eekwibble suggested.
The first demon hunters, whether enthralled by the sight of Illidan Stormrage cutting down swaths of demons during the War of the Ancients, stumbling upon a rogue demon hunter in their eternal quest to slaughter the Burning Legion, somehow forcing themselves into the destroyed realm of Outland, or by secret scrolls that have been found in night elven lands, the Night Elf demon hunter has more avenues than Blood Elves to become the predator of demons. Most, if not all Player Character Night Elf demon hunters, are going to be shackled to the fact that they became demon hunters sometime after the War of the Ancients. This is ambiguous due to the information received in World of Warcraft: Legion by the character Illysanna Ravencrest in her Dungeon Journal entry, “The daughter of Lord Ravencrest, imprisoned for millennia in the Vault of the Wardens shortly after the War of Ancients, found herself free after Maiev released the demon hunters from their prison. Returning to her ancestral home, she has sacrificed everything - including her very soul - to defend what she could not during the War of the Ancients,” being taken by some people as evidence of her being a demon hunter either during the War of the Ancients.
26 ADP, The Fall of the Black Temple: most of the demon hunters are dispatched to Marduun, leaving behind very few, including Vandel. Vandel fights with Maeiv, trying to appeal to her reason and is left for dead. In the end, Illidan is defeated as we see in the Black Temple, and in the wake of Illidan’s defeat, Vandel hears his voice call out to him, urging him to be prepared.
Simply playing the auction house can be the most lucrative gold making ventures if you have a sizable gold staff and you're not afraid to spend it. Just like a real world stock market, prices of items traded on the Auction House fluctuate daily, creating opportunities to buy low and sell high. Zygor's Gold and Auctions guide finds items that are selling at record lows for you to buy them out!
Analogy: think back on riding the swings in kindergarten. Was it fun? Now, imagine going back to those swings exactly as they were, and sitting in them now, as an adult. They're too small. They don't fit. Your feet drag on the ground because they're so low to the ground. The bar over your head is low enough that you can reach out and touch it, and even at the highest the swing will go, it's only about chest high when you're standing up. It's exactly the same swing, but riding on it now is a very different experience, yes?
Using the power of the cloud, we monitor every realms Auction House, even when you're not in-game, and process this data through our custom system developed together with gold experts. We then serve this data directly to you through the Zygor Guides Client, allowing you to gain months of Auction House analysis in seconds. What this means is that our gold guide can dynamically adapt to the unique marketplace conditions of every realm you play on. Best of all, this service is included as part of Zygor's Gold and Auctions Guide.
Each battle that you win will yield experience for each pet that participated. However, deceased companions will not receive any experience (so make an effort to keep them alive by swaping in a different pet). Experience gains are based on your pet's level compared to the wild pet. Defeating a higher level opponent will grant more experience than a much lower level one, but be ready for a tough fight!
All of this is keeping with the spirit of vanilla, which I think is more important than that a specific number be 11 instead of 12. And it would help to "resize the swing" by making the game harder to the more experienced community, and forcing people to re-discover the game rather than simply looking up whatever they want to know on a spreadsheet somewhere.
A new quest will pop up once your first pet reaches level 3. It will send you to either Audrey Burnhep in Stormwind or Varzok in Orgrimmar. These trainers will offer a quest chain to battle specific Pet Tamer NPCs on each continent. Defeating each of these NPCs will reward a nice chunk of experience for your pets, as well a Sack of Pet Supplies (which has the chance to drop the Porcupette companion, among the always-useful pet bandages).