Here's a link to the owners manual: Scroll down to the B4.250.2 and right click "Download Manual".
You'll need some source of 12V DC power which is not available on your home stereo. A 12V battery or DC power supply will work OK. You'll also need to wire in a toggle switch to "trigger" the amp to turn on. Just put the toggle switch inline with a diode for isolation between the power wire and the "remote" terminal on the amp. Flip the toggle on when you need to use the amp.
The speaker connections and source connections are all shown on page 6 of the manual and would in any case, be the same as if you were installing the amp in a vehicle. Be aware that most home stereo speakers are 8 ohms, whereas speakers and subs designed for vehicles are usually 4 ohm or sometimes even 2 ohm. This will not be a problem. you shoud be able to drive 8 ohm speakers, they just won't be as loud because the amp will not produce it's full power into an 8 ohm load. Plug your RCA's into your home stereo's preamp outputs, or if there are no preamp outputs, use the speaker level inputs on the lower edge of the amp.
Hope this helps.