First of all you should create a new character on your account on the desired server. Then you order character levelling service and give us your login and password. ATTENTION! You should not be asked for secret question and any other account details. Beware of scammers. After payment is finished your order goes to the booster. Our levelling specialists will earn all needed levels for you very fast, because they know the best routes and they do it every day. Character levelling is totally safe, especially because our boosters don’t use third-party software, all characters are hand-played. As soon as your character gets to the desired level, you will get a notification. And then you’ll be able to develop your character further and enjoy the experience of playing at maximum level.
Also Alliance currently has a 30% XP buff in War Mode (Horde has 10%) that will last the reset since that bonus changes reset by reset depending on faction participation in War Mode (so next week might be lower, or stay the same, 30% is the cap limit, it will change from 10% to 30% week by week for both factions depending on representation). It works from 20 onwards, it gives you extra abilities you can earn via leveling to use in PvP.
All I'm saying is that Blizz destroyed Levelling in my opinion. Having the option to get it all out of the way so quickly was a good idea, while still having the option to clear it all like one normally would. WoW is a game that's meant to have options, and ours has been severely reduced to 2 options; "Heirloom On," and "Heirloom Off." They even killed RaF exp gain and it no longer stacks with Heirlooms. They even killed the SoR for no reason at all. Feelsbadman.
Usually it's best to avoid a lot of instance runs. It is too difficult to account for bad groups, and some instances are too far away with too few quests. Since the experience is very good, it's a good idea to clear nearby instances which have a lot of quests once (Gnomeregan, Deadmines for Alliance). Distant instances with few quests should be avoided (Deadmines for Horde). Low level instances can be cleared by paying or befriending a single high level character. However, since patch 3.3 a new Dungeon group finding system has been implemented, as well as a direct port to dungeons (when entering the group you get ported to the dungeon and back to the same location if you leave it) and thus the travel time to dungeons has been greatly reduced. This makes it a good idea to complete quests or grind while you wait for a group to become available.