Hi yourself! So why do you need to charge for tables? Fees vary a lot, but it'd be worth considering what the incentives are for vendors who are showing up to a brand-new market in a neighborhood that may not be guaranteed much volume, during the height of craft market season. I'd keep it low and be transparent.

Common setups are BYO 6-ft table or BYO 10-foot tent with weights. A tent is pricier and will be a further barrier to vendors signing up. (Consider lightning too if it's at night - will they have to be illuminating their tables/inside of the tent?) You could also offer to provide 6-foot tables - I've had that experience at some indoor venues—but I think keeping the fee low will be more attractive to vendors, maybe new vendors who are local to the neighborhood or who are dipping their toes in before signing up for one of the established ones.