I agree with the idea of leveling one character up first. You get a much better feel for the game and for the differences between it and EQ. You can also see how PvP works from a single-character perspective, which will help you determine if world PvP will be to your liking or not. WoW is not a complicated game by any means, and it's not that hard to extrapolate figures once you've got some in-game experience.