Artist market

Im so excited! I found out there's a nice arts and crafts market
that's held in downtown jersey city every friday! I signed up to
participate and to rent a table is just $25! Things can't get much
better... But this brings me to the question, who has already been to
a craft fair/artist market? I've never attended one before, so im
nervous. I've worked in retail before so I know how to handle
customers, but retail means set prices and already laid out customer
service rules... can anybody give me some advice?