If you're having trouble with questing, download an add-on called "QuestHelper". Simply extract the folder in your World of Warcraft\Interface\AddOns folder and it should be good to go (make sure you have the WoW client closed when you do this). It will make the already simple questing of Cata even simpler, and even more fast.
As stated before, if you're interested in twinking, it's better to learn the class yourself, which is best done through the leveling experience.