I agree with Ellay, gear until L58 and Outland quests is not even worth worrying about. Most stuff on my 3x Shammy team dies before it hits me anyway... Your big upgrades come in the form of new spells until L58.

I also think when you hit 70 (or heck, before it), BGs are a good way to hone your movement/macro/fighting skills. I plan on running Arenas and BGing it up a LOT once I ding 70. There's not a ton of dungeon/raid gear that can really beat the PvP stuff... Heroics with badges are the only real exception.