Rich, Ford has already wired your Aviator for towing, mostly. The Aviator is wired to accept a 4-pin connector and the connection for the brake controller can be found behind the glovebox for the brake controller, although, you probably won't be using one.
If you're going to use a brake controller, you'll want to purchase a 4-pin to 7-oin connector and mount it in the back. Run a 4-pin adaptor to the factory one. Splice in the brake controller wire (it's blue) from the from 7-pin adapter to the blue wire.
From the 7-pin, there will be two wires: one ground and one hot.
Here's the basic adapter and I think it's all that you will need: