I have only been messing around with pvp for a small month now, and I certainly don't claim to be an expert on this matter, but from what I can tell agility, stamina and resilience are pretty important.
Agility simply because it's important to any feral druid, stamina because more hp means staying alive longer (hopefully long enough to pop a heal on yourself, break los or kill the other) and resilience because it really increases your survival chances against other players.
Beyond that learn to love jumping back and forth, blending in with the crowd whenever possible (especially when playing in wintergrasp) and don't stand still unless you're absolutely certain you can safely stand still behind the enemies back. It's a lot easier to target and hit a target that doesn't move, unfortunately.
I have to get going now, but overall try to not become discouraged if you die a lot at first. After all, most enemy players tend to play smarter than npc's. :)