DevonDiver
N/A
Thailand has world class diving. If the goal is to come home with world class footage, I would learn and practice in the US or Caribbean until my skills were good enough that I could shoot quality UW video.
You've never been to Koh Tao have you?

It's not 'world class' in Koh Tao... but it's comfortable, undemanding diving.... and it's v.v.v.v cheap (both to dive and to live).
The place is hugely popular as a training location, because of the prices, but for the real quality you need to get across to the west coast or down to Indo/Borneo (easy and cheap with regional flights or buses etc).