There are many different types of waterproof cameras available for purchase and for ultimate beginners, it is ideal to purchase a digital camera first.
With waterproof cameras that require films, all photos are final. There is no checking to make sure they came out just right but this is one benefit you get with a digital camera.
Once you have taken your picture, it can be checked to make certain it is perfect and if not totally happy then you can always delete it and try again.