I don't think you need anything here except proper diving instructor certifications from PADI, SSI or NAUI. Obviously you need to set up a business but I don't think the Government has any special certification within the MOM in this regard. Oh yeah, plenty of Insurance!
SOME PEOPLE TRY TO TURN BACK THEIR ODOMETERS. NOT ME. I WANT PEOPLE TO KNOW WHY I LOOK THIS WAY. I'VE TRAVELED A LONG WAY, AND SOME OF THE ROADS WEREN'T PAVED. ~ Will Rogers