You are luckier than most people posting questions like this, in that you still have the connectors on the speaker wire. I.e., at least you know what wires are actually connected to speakers somewhere.
Your best bet is to find an amplifier that accepts those connectors (it may require more than one to get everything working). Check Niles and Russound, and Home Theater Direct. You can also find other amps by searching 6-channel amplifier, 8-channel amplifier, etc.
After that it’s just a matter of getting a music source (i.e. component) to connect to the amplifiers.
Regards,
Wayne A. Pflughaupt