You will definitely need some form of shelving to raise your products up off the table so people can see what you’re selling from a distance. Something that is quick and easy to assemble on market day.
Shelving is also a great way to get more room/space to display your products. You may be limited to just 1 table at some markets so having shelving can give you that extra room you need.
You don’t necessarily need to purchase brand new displays of Amazon etc. You can also check out unique items from thrift/op shops. If you’re just starting out, buying all these things can be costly. See what sort of items you have around the house and/or ask friends and family if you can borrow from them. You’ll be surprised at what you find.
Signage - even though you may have individually priced your products, I still find so many people asking “How much is the…?” You could use picture frames for this.
Baskets - Thrift/Op Shops often have heaps of these. Get an assortment of different styles/designs. To clean them use the upholstery attachment on a vacuum cleaner and spray with disinfectant.
The possibilities are endless.
Best of luck. 