on the side of your car your battery is on run your power wire down the carpet on the inside of the car. you may have to drill a small hole in your firewall and place a grommet in it to protect the wire.
Run the RCA's down the opposite side of the car from your head unit to prevent road noise or alternator whine.
By the way to hide the wires either go the long way and take your seats out and run it completely safely under the carpet or pull the trim off the inside of the doors and pull the carpet up a little and shove it in haha.