Amps and subs!
 

I'm new to the whole car audio so just looking for a little help. My vehicle is a 2013 crew cab duramax. The back seats raise up in the 20/80. I'm looking into getting a kickass sub system. I would like to keep it under about 1200. I was looking into the sundown 12" subs and maybe a rockford fosgate 1500 watt amp. Anyways I'm really confused on the ohms and stuff and wondering if the subs would fit in a box under my seat and if I should get a ported box or something??? Sorry I don't know much. Any help would be much appreachated.

I'm also up for other subs and amps. Just looking to get something that really thumps that's easy to hookup and install.