Got to each of the rep vendors, and see what you can get. You probably don't have the rep for the good (exalted) stuff, but there are probably other things to start off. (Only item I can think of off-hand is the head enchant from Wyrmrest at revered, for SP and mp5.) Work on your rep. Run the high level instances, along with easy heroics, and see what you get. (You can also look up drops by instance.)
If you're in a guild, run stuff with them. If you're dual specced, you can go as a dps and get healing gear.
Oh, and there are crafted pieces. Titansteel guardian is a good starter.
Edit: Because I didn't realise I had moved to the shammy forums (thought I was on general), and my post was needlessly rude/condescending.
Edited, Jul 13th 2009 6:10pm by arnlell