possible career

today I was talking with a few friends about starting up a business in the health and fitness profession. And I wondered about how to go about this because what I wanted to do was a martial arts school with physical therapy and fitness. And I didnt know how to start or even get this off the ground. Maybe make a few videos on YouTube or starting my own blog and facebook dedicated to this business but the major problem I have is finding out where I can get the certifications I need to do this. The physical therapy certification; I can either get that through schooling but the more practical way is go into the army and do 4 years of that and get on the job training. And the fitness certification I can probably get that online or through school but that's all I know. I would like to hear your input and advice on this thank you.