your card should be fine. What's nice about WOW, is that you can play casually and have fun. In fact i think it's more fun than to be hardcore in it. Hitting level 60 sucks, there isnt much to do unless you really have no life and want to repeat some instances a million times. PVP is fun, if you go on a pvp server, otherwise, even with the honor system, its kinda bunk. I reccomend the PvP servers actually, it can be frustrating, but more fun in the long term. And pvp is fun at any level, the honor system protects you from ganks for the most part. (level 60 hunting newbs)
fee is about 15 bucks a month, you pay less ifyou buy more months