The above poster is correct. Sorc is fairly simple to level, and both dps talents are viable. I used level 20 pvp gear until almost level 35, and did not replace my level 40 pvp gear for the most part until I was level 50.
I leveled using lightning until I was in the 40s, just use lighting bolt till you get chain lightning buff and that should pretty much give you a the win (shock also helps since its a great cc + damage). Don't be afraid to heal a lot once you get the talent that gives you two casts that are cost free when you crit.