Do you need a license to sell here?

I would have to agree with Peachy Ski but, that question is worth looking into. Googling your question I found this. Q: Who must have BOTH a State of Arizona Transaction Privilege (Sales) and Use Tax License AND a City of Mesa Transaction Privilege (Sales) and Use Tax License on file with Mesa Market Place: A: Any Merchant, who sells merchandise or exchanges monies at Mesa Market Place. Hope that helps.

I think you may need a reservation but it probably depends on what you are trying to sell. The safe bet would be yes