Do they have an outdoor flea market ad well and who would I speak with about becoming a vendor

No they don't have an outdoor flea market. Only inside.

I guess you ask one of the cashiers about who you speak to become a vendorI guess you ask one of the cashiers about who you speak to become a vendor. And I don't know about any ads because my sister lawn brother-in-law are the ones who told me about it when I was down there visiting with them