You did good. I love them all. I wouldnt wash them until after they hsvr been quilted. Then soak in a tub sink in oxiclean. You will be amazed how much stuff will come out of them. You will have to drain, the refill the sink several times, then soak the stained one for uo to 24 hours if needed. Drain, then rinse several times till water runs clean. If the fabrics are up to it, you can put the quilt through the spin cycle only in your machine to remove most if the water. I then lay the qjilt flat on the bed to dry.
I would back them with unbleached muslin. Finding a binding fabric to match may be difficult. You may be able to find a vintage piece for that as you will only need half a yard or so.
Good luck with them and post pocs of the completed qyilts.