The 1st class you want to take is Open Water Diver, if you want to be a certified diver, with this you can buy air, and scuba gear. Discover diving is just a way to experience diving with an instructor, and no certification. You should plan to start with our equipment, and let the instructor, or myself look at what equipment you have. Dive gear is a life support system that needs to be serviced by professionals. When you take the course alot of questions will be answered