How familiar are you with WoW PvP?
If you're going in completely green you're liable to get stomped, and it may be worth playing around some at low levels to get the hang of it.
But if you're feeling up to it, just buy your intro PvP set and go for it. The gear imbalance didn't feel too bad to me entering just recently with my warlock; whatever that's worth. I mean you're going to have trouble going toe-to-toe with anyone who's fully decked out in epic gear, but that's not everyone. *shrugs*
Edited, Apr 13th 2011 10:11am by someproteinguy
That monster in the mirror, he just might be you. -Grover