What kind of wire do I need 12 or 14, not sure what the numbers mean. Also does it matter if I run the wire in the wall, does it have to be inwall wire.
For short runs (up to 40'??) 14 gage will do fine. For the really short stuff 16 is also fine.
Axiom has reasonably priced wire as well. Not quite as inexpensive as Monoprice, but since you are ordering anyway...
You can also use speaker wire from Home Depot (copper is copper)but its not as flexible as the Axiom stuff or some of the stuff at monoprice.
Edit: the higher the number, the thinner the wire is.