A true benefit of Macro or Muck Diving is you can have amazing dives and breathtaking photos under any conditions. Often you are not dealing with big currents and the subjects tend to be slow moving, allowing more opportunities to get that great shot. As well, you tend to move around a lot less, making for a more relaxing dive experience!
Learning the skills for this type of photography can come through courses, either taken on-line, in a class format or one on one and available for the beginner or even seasoned photographers wishing to learn the latest techniques or lighting methods.
First learn the technical skills with the camera and lighting, then put it to use under the waves.
Mastering your diving skills early on is advisable, such as buoyancy control so as not to stir up the bottom, resulting in unwanted backscatter (particles floating in the water which ruin a shot) as well to protect the reef or critter you are wishing to photograph.