RJP has offered the best advice so far for your situation as it appears. Taking a camera, especially a video camera, underwater and expecting to find work with it will be next to impossible unless your diving skills are way above and beyond the average recreational diver. Until you can say they are then you will most likely be wasting your time. It doesn;t matter how good a photographer you are on land. Underwater if you can't hold still in the water column, stay off the reefs, and know more or less instinctively what you need to do when actually diving, taking a camera is not only unlikely to result in bad shots or a poor product but could also very likely make you a risk to your self and those who dive with you.
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I'm glad to know that every time I see a good photo taken underwater that an absolutely excpeptional diver, one with exceptionally better skills than most recreational divers, was behind it. I find this an especially important piece of info after recently being on a boat with a diver who could not assemble her own gear, was uneasy about doing a giant stride, and had no clue how much weight she needed. But, she took some great underwater shots on that dive that we were all able to enjoy on our surface interval. I guess instead of assisting her on the boat I should have been asking her for diving advice.