Although I can not agree with their quality I will go along with it.
Basically what you have there is a 12" sub with two voice coils that run a 2 ohms. The sub will run 400 watts rms (normal operating) at 2 ohms.
The amp is a two channel which is for powering two subs or two speakers. Since you have one you will need to bride the amp. This will however only allow you to run the amp stably at 4 ohms. The plus however is that bridged it will put out 560 watts rms.
I would suggest getting a different amp, preferably a mono amp (single channel).
For a box, I would recommend a ported box with at least 1.5 cubic feet. This is a good candidate
here.
Assuming you keep the equipment you plan on, this is how you will wire it.
First, wire the amp to the car (power to battery, ground to solid ground, remote turn on, RCA's from headunit). Next, to wire the amp to one channel or bridge the amp, you will run the positive from once channel and the negative from the other. If you are facing the terminals on the amp, there will be 4. From left to right we'll number them 1 2 3 4. So you would run 1 as the positive to sub, and the 4 to the subs negative.
Wiring the sub is simple and this applies to any dual voice coil (DVC) sub. On the sub, there will be two terminals with +/-. Connect the positive of on terminal, to the positive on the other. And, likewise, the negative on one to the other. Then connect the +/- of either terminal to the correct places on the box's interior terminal. Mount the sub after that is completed.
Finally run the positive and negative from the amp, wires 1 and 4 respectively, to the box's terminal. Wire +>+ and ->- of course. Use speaker wire the wire the sub an amp up.
If you have any other questions feel free to ask here or message me at anytime.