Dave,
I do a few shows every year and everyone is different.
Check out some shows and see what is selling and ask questions. Lots of questions.
I only do craft show because almost everyone showing up is looking for crafts. At a flea market a few of the people showing up are looking for crafts. It is a good way and a cheaper way to learn about people and how to set up your booth. You should do a dry run before your first show. Make a chect list of everything you need and start putting things in a tote. Money bag, plastic bags. change, business cards,cords, price tags,tape.note book. Keep track of what you sell.
I sent you some info. You must get them into your booth before you can sell them anything so the hardest thing is getting them into your booth.
Email me if you need any more help.
I could go on and on.
Michael