Are you just doing a one off market Amy? Or looking at doing them regularly?If your doing them regularly I wouldn't make too much for the first one, once you have done one you will start to work out how many of things you need more of or less, what sold the quickest etc. I'm no expert but I know when my friend first started she found the cakes went pretty quick and the slices, biscuits were a bit slower. She used to bring home what she didn't sell and have a Facebook sale of what was left. My friend also uses the throw away plastic containers for biscuits, slices and muffins. And cakes made into a loaf shape just wrapped in glad wrap and labeled.