There are relatively few avenues for selling your profession's wares. The first, and probably the most universal, is to create your trade goods and then list them on the auction house. This is a pretty common channel for selling trade goods. As such, there's more than a few techniques and arts to getting the most out of working the auction house. Check out Gold Capped, for example, to pick up a lot of great advice on how to work the AH.
The second way to sell your goods is via small-scale professions gathering.