It would help if you put your location in your profile.
Recommendations would be much different for Key West, FL, than they would be for Syracuse, NY, or Taos, NM.
Also, most states in the US require a Nursery License if you plan on selling live plants. Please check your state regulations before committing significant time/money into this
project. That being said, there are thousands who do this without a license. How tough is your state in enforcing these regulations? What are the consequences of getting caught without a license? Keeping low-key might work for awhile, but any type of advertising might attract the wrong type of attention.