I am a typical diver, who went to many dive shops all over Canada and the States, it seem I always go back to "my dive shop", when I want something. Having a repore with the owner and going diving once and a while with him has not only made me a better diver, but, made me a good customer to him. Smart business and good dive buddy. Personal attention to your regulars while promoting your business (discovers) will keep you going and give you a business to support your passion. Good Luck !
let me know where you start up, I love to travel.