Joe, welcome to the board! As far as adding cruise and audio controls, you may be better off starting a new post about how to add them. The steering wheel change/ audio control addition is mainly for a truck that came with cruise control. To add the cruise, I imagine (but am not sure) that you would have to add a wiring harness to the column and a BCM programing/replacement. Once again, a new post would probably get the traffic you need to answer your question.
Galen
P.S. Thanks everyone for your help. I ended up getting a good deal on another steering wheel, so I didn't have to splice any wiring like I first thought I would have to.