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.
Furthermore, we highly recommend you plan in advance regarding the class that you want to play. In the Classic WoW, there were no class specs. Every talent point spent couldn’t be changed without first resetting all of them and the talent point reset was a costly practice. If you already know what you want to play as in the end game – try to develop your talent tree accordingly. This way you’ll be able to save a lot of gold in advance.
Gold in World of Warcraft Classic is an integral part of the game. In this article, we will discuss the importance/role of gold in vanilla WOW and how you can obtain it easily. Gold was vastly more important in classic; it gradually became less relevant/powerful as time went on in the current version of the game. It is very tedious (but not difficult) to gain gold in vanilla, which is why many people choose to purchase gold.
And once you had been performing so 10-12 hours a day for weeks on end the thought of that time you’d already sunk into it made it rather difficult to stop. Combine this with the fact that missing a single day could put you back a full week of progress and you’ve got some pretty bad mojo going on.It may be argued that the Vanilla PvP honor rating system attested a lot of the negative perceptions about the MMO scene and video game addiction generally at the time. IMO it would be an error to reinstate it.
Keep in mind that these quests are optional, and are not necessary to continue leveling and capturing companions. They are also account-wide, so if you complete the quest chain on one character, you will not be able to complete it again on another. However, any progress that you've made will be saved and you can pick up where you left off in the quest chain on another character. The dailies that you've unlocked will also be accessible by all your toons.
Unlocking the Lightforged will require you to complete the aforementioned Argus storylines and earn the “You Are Now Prepared” achievement. In addition, you’ll have to earn Exalted status with the Army of Light. As with the Argussian Reach, this one could take a couple of weeks, as it is time-gated. However, the main story quests should help you at least reach Friendly status with the Army of Light.