I keep new fabric off the shelf until it's washed. If it's on the floor and I just used it in a quilt, then I know it has to be shelved. Otherwise it needs to be washed.
I must be the only person who washes fabric by hand in a plastic basin, several pieces at a time. Then I hang it up with skirt hangers over the bathtub if it's not hot outside. This is for fat quarters up to really big pieces. Then I just fold them, only ironing when I need the fabric. They don't get all gnarly from the dryer this way.
Anyway, my best advice is to keep them separate from your washed stash until they are ready to go there.
Kathy