Your spread looks good for your first time. I've marketed my own veg/fruit/products at farmers' markets as well as have been a market manager for a few other larger farms.
Market day is a slog and goes really well if you're prepared for it to be a hella long day and you're well organized and willing to talk to a lot of people without making money. Especially for crops that aren't in a general rotation at a grocery store. Folks just aren't used to having the diversity of foods that exist outside of a grocery produce department. Recipe cards and samples have always worked really well for me. Sacrifice a bag of mint for people to fondle, smell, taste.
Gardening books and cookbooks from your own collection available for customers to glance at to get ideas and confidence (make sure you mark your books and communicate that they're from your personal library and are not for sale, because they will grow legs otherwise).
The more willing you are to socialize over the foods and about the foods, the better your sales will be. Also, talk to other farmers about their best marketing practices. But beware, not all farmers are neighborly and will be willing to have collaborative competition over the indoctrinated capitalist kill-or-be-killed mentality. It depends on your area. I've seen a real mixed bag in attitudes at all the markets I've been to.
Insofar as keeping your greens from wilting, as others said, keep them out of the sun. I've found keeping a spray bottle with cool water to spritz them and keeping most of the greens in a cooler and only stocking a few at a time is helpful. Be sure anything that you purposely keep a low stock visible that folks know you have more. You wouldn't believe how many people will pass up buying your kale when they only see 3 bunches out because they thinking they're being nice to the "next people who might want it." Let them know you have enough to go around and they wouldn't deprive the next customer if they wanted kale too.
Also, not sealing up your plastic bags will help the longevity of your greens. Those ziplocs are like little greenhouses and can heat up and cook your greens in minutes, even when they're not in the sun. Allow some air to flow.
Anyway, those are my initial thoughts. I may be able to offer other insights if you're interested or have questions. Feel free to hit me up.
