I just in the baby stages of my home based business. I do a couple of practice cookies. If they turn out well they are sold but if I mess any up, and I usually do, I refer to them as casualty cookies and my husband and son eat them lol. Or I feed them to my chickens. i am finding the more cookies I make the fewer practice cookies I need to do. I also practice on parchment or waxed paper too.
Good luck and happy cookie-ing !