FL-NC
Member
From a legal standpoint, you need to know the 4473 up and down. Also the process of NICS checks, and that is the minimum. Add to that whatever your local/state laws have, then whatever the store's policies are, inventory control, safety, etc. From a business standpoint, you need to know the products, and be incredibly patient with people's opinions, intelligence (or lack thereof), and every other annoying thing that customers may throw at you.