subwoofers

I just bought a 2005 chevy tahoe and I tried to wire up two 10" jbl 1000watt subs in parallel with an Autotek m4000 amp. I've got a little experience wiring subs and I've wired my own in a 2000 impala but I wired these ones and they do not work, the owner before me wired up a touch screen...

i own a 1998 4door chevy tahoe. I've never installed or owned subs before. Where are places i can get subs installed/purchase them? how much would all of this cost? rough price estimate?