You might want to read the rules of this area, this area is for saying hello and that is it, if you want answers to your questions post it in the Audio/Visual Tech area
Go to best buy, Circuit City, or any store that does mobile audio, tell them the model number of your head unit and what kind of car you have and they'll give you a wiring harness that is plug and play. No splicing any wires, it's a beautiful thing !!
use the metra part number 70-1771 and just ground the wire that says amp ground wire to your standard ground on that harness too...it will run ya bout 20 bucks