Once your certified open water you're good to go for recreational diving. Couple hundred bucks.
I'm currently divemaster but rescue is by far the most useful course I've taken by far. Thinking about doing a tri-mix cert and trying 150+ depth. It's funny I have my gas blender (to make tri-mix) but not the certification to use it.
Wish I got into diving when I was your age. You should get your divemaster then go somewhere like Thailand for the IDC.
I'm planning for this to be my retirement job :-D
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Cool! I'd be a divemaster by now but I'm to young sadly. This year is the first time I can get rescue certed ( I'm AOW now) so I'm going to get that cert I'm august then divemaster when I'm 18 and everything else I can get between now and then as well
Wish this could be my regular job