I make quilts for customers all the time and I can tell you from experience that you will never get the dollars out of that quilt that you put into it in time. Most people run when you start talking how much fabric costs. My suggestion is to figure up all the costs of fabric, pattern, thread, batting, backing, etc. and double it for your labor cost. Experience makes me tell you to get the cost of materials up front (non-refundable), before ever buying the first yard of fabric. Then require complete payment of labor costs (within 30 days of notification) before releasing the finished quilt. That way if they default on the labor costs, you still have a quilt to sell. Get EVERYTHING in writing, with customer signature. This prevents any future issues on what thread color, quilting pattern, binding and such. It is hard sometimes to do all this with a good friend, but you need to protect yourself first. And if you let one friend do it with no deposit, the next one will say "But so and so didn't have to give a deposit". For some quilters, making quilts to order becomes a job, and not near as much fun, so be careful that way too. Good Luck!