look for an amp installation kit(it should include power wire, ground wire, 12v wire, RCAs, and preferably speaker wire). To put it on a stock HU you will probably need a line-out converter but I'm not sure where you can get one of these
You can find an amp installation kit at any car stereo place or even in a car parts store. (auto zone, pep boys...etc) They range anywhere from $30 to $60 depending on the gauge and quality. A LOC is about $20-30.