Weights are the most important thing....next to the tent...get an ez up or another brand like it. I have 4" PVC pipe with a bottom cap and filled with cement..another cap at the top, with an eye bolt inserted in the cap. I have 1 for each leg, but for windy conditions I have another set to add on. These weight about 28# each.
Cinder blocks tied with nylon rope will work, so will weights from a weight bench...
Use a table cover that goes to the ground, so you can store boxes,etc. under the table....don't use plastic table covers, it makes it look amatuer.
Be prepared for all weather. I also have clear shower curtains to attach across the front of the booth so people can come in and shop, but my merchandise doesn't get wet. You will need 3 shower curtains and 2 5' pieces of PVC plus a connection in the middle.
Good luck