If you buy a ready character in World of Warcraft, you take all the risks, because the first owner can easily always get his account back, and you will be left without the character and without the money that you paid. That’s why we strongly recommend to order a character levelling instead of buying WoW character, so you will be the first and the only owner of your World of Warcraft character.
Anyway, there are no more shortcuts. There are no more "Tricks". It's just straight questing now since Blizzard nerfed other methods of leveling. You can still do dungeon spam, it just won't be as fast. You can still do BGs, it just won't be as fast. Just about the only alternative way to level that rivals questing is Pet Battles(which makes ZERO sense).