I don't get the whole skills/spell thing in WoW. Ok, you start off and you go to ur trainer. There are 3 different categories with some skills/spells under each. Ok you buy one, its gone. So you buy all of them and they are all gone. What do you do then? Do more come up at a certain level? Is there something you need to do? Some one please explain. Also do you like invest in one of the categories like say there are Sword skills, Magic, and Buffs. Would you choose one of teh categories and invest in that one? Someone plz explain!