It's been a few years, but some are really profitable and some barely make your expenses. Make your tablecover white or a light color--not a print. Have something to display your items--a 10 foot table isn't very long, especially if your items are large. You don't want to have them so crowded that people can't see the items. Having someone to share the cost is a good idea, but that shrinks your space to 5 ft. We did a show once--Christmas--and they had 3 shows very close together. Admission was $$ or cans of food for a food bank. We thought it would be a very successful show. Barely made the cost of the table. You just never know. Good luck.
Sue