With upcoming World of Warcraft expansion Warlords of Draenor set to allow players to jump right in at level 90, Blizzard has helpfully decided to release a for new players unfamiliar with the game's many eccentricities.
There's a guide for each class in the game, giving basic advice on how to manage your new fantasy avatar. Here's the warlock and paladin videos. You can find those for the remaining 11 classes
There's also a '' if you're interested in auto-leveling your character but don't know what the process entails.
World of Warcraft: Warlords of Draenor currently has a tentative release date of Fall 2014.