My suggestion would be to get a few snapshots to start with, and start looking at the unique features of the Tauren (or whoever) and search through the BF store, or the Lego site to see if you can find helmets, armor pieces, animal features that somewhat match. The Bricklink catalog search is a great source too.
I just googled the WOW Tauren, the head could be started with the Brick Warriors Minotaur (spelling ?) head piece, the new Lego one, and BF's horns ... hopefully that can get you started :o)
Sketching out the main features that you want also helps make clearer areas or pieces to look for.
thanks ill defietly buy some minotuar heads and probably make a clay beard on it like my character has