Im Getting 6 12" kicker CVR Subs What amp/amps do I need?

Okay so i finally decided on getting 6 12" Kicker cvrs 4ohm i was wondering what amp/ amps ill need to get? I have about 200 to 300 bux to spend and used is fine (always get a better deal with used stuff) and i was wondering if im gunna need another battery if so what do i need to get and what do i need to do to set it up?