I have a 2000 Mercury Sable and you need to purchase a new faceplate if you want to put a head unit in. I got mine from Metra for like 60 bucks. Also, my sable has four 6X8's, but yours might be different.
The rest of your post......You need to give us a bit more info. You say u want that kicker, but you gave no budget or anything for the rest of it.