Best professions for a PVP warrior?

Hey guys, I'm going to do only arenas with my warrior, and I'm curious on what the best professions are?

I have gold, but my server is too low populated to buy all the mats on AH. (On grim batol EU)

But i'd like to get professions that isn't too hard to farm! like alchemy and herbalism was really easy. '

I appreciate all help!