looking to start backyard fish fry
i'd venture that you'd need some business license, and there are likely zoning laws that would prohibit or otherwise restrict the commercial use of your residential property. http://www.dat.state.md.us/sdatweb/checklist.html#zone
i'd suggest that the specific answers you need will only come from the state authorities. contact your local elected officials (county board of supervisors or the like) -- or the country manager's office (if you have one). i'd start there.