I'm on the east coast, so sorry no suggestions. But you would need a $20 kit, easy to find (even CC would have one for you) and a wiring harness. And if you car is double din then it would be much easier than you think, for your system as ordered. Although, you may want to reconsider your wifi, they seem to REALLY prefer if you stick within the program for hardware. Your choice, but you've been warned.
But if you are feeling unsure, then going with a pro is always the best. Hopefully someone in here will eventually throw you a lead, in the meantime there is always CC or BB. I know there are whole threads in here devoted to avoiding the chain electronic stores, but the Pasadena, MD Circuit City was very helpful...recommeding two pro installers