The use of your panels on front wall behind speakers and possibly between and at reflection points on ceiling and floor between speakers and listening position are great places to start.
You might consider framing your panels with 1" x 2" pine. Back with cardboard. Cover with burlap type material of choice. Look into making your own bass traps for corners.
You might consider framing your panels with 1" x 2" pine. Back with cardboard. Cover with burlap type material of choice. Look into making your own bass traps for corners.