Sounds like you'd enjoy hunter.
I've heard pretty bad things of hunters, they even have their own derogative name "huntards" lol. Though, it must be challenging to play them well which is an attractive feature.
Keep leveling up the lock then. I used a demo lock for Arena/PvP and the control and damage were pretty insane. There are still some pitfalls like with every class, but most matches flew by when I went demo.
That said, I have an 85 lock and mage. I don't play WoW that often so I just put in an hour or two a day to collect better PvP gear and start recording Arena/PvP once I'm maxed out. It can be good fun but you need to seriously schedule some time in if you're new: I tuned out my friends for weeks when I first started playing, then some time later came to terms with my....habit of activity.
I haven't ventured that much into pvp, except for a couple of bg and some instances. But some people on the wow community are total immature assholes, and I'm not that interested in delving in their drama. Besides that, pvp sounds interesting once I'm more comfortable with the mechanics of the character and the game itself.