I have 2 big floor speakers, and 2 small wall mount speakers. Here is an image of my layout. Where do they go?

Better help here.

Assuming that you spend most of your time on the couch, you want to get the front speakers pointed toward you. The human ear can hear from 20 to 20kHz. Bass notes and tones at the lower end of the spectrum are non-directional. As long as the speaker is in the room with you it's OK. This is the theory behind Bose systems with a bass box that can be hidden and small directional speakers that you mount on the wall or ceiling. Think of mid range and tweeters as if they were flashlights, you want them to point towards you for the best imaging. Go ahead and put on a movie and walk around your room....you'll see what I mean as you move in front of the speakers as opposed to being beside them. If you sit where all of the speakers are pointing toward you and are equal distances from you, you'll achieve the imaging that was intended when it was recorded. What will really make a difference is having a center channel speaker on top of the TV for voice soundtracks during movies. There isn't enough room on this page to explain this thoroughly, but I hope this condensed version helps.

Mike my friend it really depends on the shape of the room geometrically. The way the bass reflects off of the walls can be determined by trial and error meaning shift the floor speakers around until YOU find YOUR desired sound. As for the satellite speakers those will probably work out best facing the sofa from the sides of the sofa. I installed home and car audio when I was young and this was the best way to achieve optimum sound when the room or system wasn't designed for it. Good luck friend!