There’s a few good pics for setups here
You’ll want a mix of things in a variety of colors, styles and price ranges (and have things priced, a lot of people really hate to ask). Really big fancy flashy items draw people in to look around, but the smaller stuff sells faster. Use different levels, like shelves and such to get more space out of your table. If the market itself is themed (for example, summer, gaming, school or Christmas) it can influence your inventory.
Being able to take multiple forms of payment is a plus. Also, make sure to have proper change if you’re taking cash.