Need help with new kitchen sink plumbing
You'll want to mount your disposal so the outlet of the disposal can mate up with the pipe that's connected to the wall. It looks like it's currently positioned pretty close if you mount the disposal on the right. If you want it on the left then you'll probably need to shorten the pipe going into the wall and swing the trap around 180 degrees. The outlet of the disposal should point down and it will fit into the opening on the pipe that points up. The horizontal inlet that's on the pipe that's connected to the wall will conect to the pipe laying on the ground, the other end of that pipe will connect to the sink strainer.