you need a amp install kit, 20 bucks or so at walmart. ( theres different kits for more or less power amps) a set of rca cables, amp to sub box.

depending on your radio stock or not you need to tap for the sound. either more longer rca cables, radio to amp, or one of them level line out put things.

heres a vid for a stock radio, the guy in the vid is slow and boring, but this is what you need to make it work.