Hello, I took out my am radio and installed an aftermarket radio. Warning..lol, I have no experience in car audio so this is my first install. Do I just need to hook up the rear speakers, and the single front and then the 12v power source wire? Any others I need to hook up to my original wiring? Also since i only have one front speaker (for now), do I just take one side of the LH or RH leads to hook up?