Technically the color issue is not important since the CC-372 comes with its own keystones which match the color of the module. Yes you can use bare wire on both the front and/or the back. You would screw off the connector and insert the wire to the binding posts then screw back on. 12 gauge wire is fine for this product. The sub connector on the back is an F connector. So RCA on the front, run coax F connection from the back. You may consider running over to another “F to RCA” wall plate over by the sub, that way you can come out of the plate with a short RCA cable and plug directly into your powered sub easily with minimal wiring.