Mary Anne, Most of my custom orders are pretty straight forward. The customer sees a sold item in my shop, or chooses another book title, and I make a wreath or cuff for them. In nearly all instances, I make the listing for the full price, they purchase the listing, and I make and ship the order within 10 days. If it is a very large order, I will make a listing for half of the price, the customer purchases it and I make the item(s). Then when it's completed, I make another listing for the remaining balance including shipping.
I'm sure many others here will have great tips for you. :)