I am a former Infantry Marine, working in the Executive Protection business, and looking into starting out my own small Firearms Instructor business. Currently in the process of taking the needed NRA Certification, but was wonder if there were any other things I should be looking into. For example, should it be a DBA or an LLC? What else might I need to research? I plan on trying to work part time for an already established Instructor/Company before hand for some experience, but am starting the research process now. Thanks in advance for any advice. Semper Fi.