How much for a spot? Do you pay in advance or do you pay that day? What time do you have to get there to set up?

I would say before 7am because it gets crowded fast.

You pay in advance for permanent booths on the barns. You can pay, the day of, $30 for an outside spot.

Yes

$30 a table and the ideal time to get there is around 7:00 am so you can choose a top row spot.

I believe $20 to $30 a table.