With the power buttons and case leds the comon color is the ground or -. So in your case the white wires are the -. Dont worry if you get this wrong because you can just flip them over later if they dont work.
Both drives need thier own sata cable to connet them to the mother board. Thats how they talk to the baord. And they need thier own power wire from the PSU, they need electricity to work.
Ideally you want to plug the ssd into a 6gb sata3 port on the mother board. The HD should plug in after you have windows installed. For now just get it put in place but dont plug in the sata cable yet.