How would I connect everything?

Also here is a Youtube channel run by a couple of electrical engineers who have been involved with audio for most of their careers. This is where I have got a lot of my information from: https://www.youtube.com/channel/UCF9cWy6zaWsgdAy-kv2q4VQ

Their focus is more on home theatre, but many of the concepts remain the same. They don't cover much about balanced to unbalanced, but they do have a video on subwoofers, among other things.