Create an order form that spells out you will charge 1) cost of all materials 2) per hour rate of $??per hour 3) delivery or shipping charges. Then list what your APPROXIMATE time would be. If you machine appliqued this new binding on a queen quilt, you have an idea what time that took. You can use that as a basis. EMPHASIZE that this is an estimate and you will contact them is it starts to vary from that. THEN TAKE A DEPOSIT.