How you use it will depend on what other gear you have.
If you have an AVR or HTS with multiple HDMI inputs then connect all you sources to that with HDMI. Connect its HDMI output to the projector with a cable that has mini-HDMI at the projector end. That projector will only produce an 854x480 video resolution so you may have to adjust the resolution of your sources. Since the panel is not 16:9 you won't even get SD on 16:9 video.
If you use the built in USB port to play movies you won't be able to get audio from it to your audio system. The sound will come out of the built in speakers.
Overall it's not a home theater projector so the result might not be satisfactory.