On the other hand onions, shallots, garlic, winter squashes should be kept dry and love being in the sun all day. Shade is very important because limp, sunburned lettuce does not sell well. Since farmers' markets are held rain or shine, investing in a tarp or cover is practically essential. Many clever home-made designs for supporting tarps look quite attractive, but make sure your structurecan withstand the wind. Beach umbrellas work well for small setups, but shade-only umbrellas don't help much on a rainy day.
Umbrellas are especially troublesome on breezy days.
A legal scale maybe helpful if you are to sell by weight. Some products sell better by weight rather than unit, but there is no reason to purchase a legal scale if the size of your operation does not justify the expense. The average customer is shy, and will not ask a price. A large, attractive chalkboard or individual price tags for each container of produce is welcomed, especially for shoppers new to the market or new to your stand. Develop a kit that comes to market with you.