You're going to need speakers and a speaker amplifier as well, unless your plan is to listen only to bass.
You'd connect the phono preamp to the passive volume control. Then connect the volume control to the Line In on the plate amp. The plate amp goes on the back of the subwoofer box, so the wires on the bottom connect to the subwoofer driver itself (it will have two prongs for + and -).
Connect the Line Out to your speaker amplifier, and run speaker cable from the speaker amplifier to each main speaker.