I want to do free style diving?

Question

Is there any advice or preparations i need to know or master or be careful of?

Answer 1

****I believe you are asking about FREE DIVING which is nothing more than snorkeling to a level of expertise.  Start gradually, and you will want to work hard on your cardio skills by perhaps jogging, and practicing how to safely control your breathing.  

There are also elements of SCUBA that you would be wise to examine, such as how to clear your ears, mask, etc.. The effects of water pressure at given depths.  Every 33 feet is one more atmosphere of pressure.

Start slowly, and you'll do fine.  

NEVER DIVE ALONE!

Answer 2

Go for proper training. There's a lot to learn and the best way is to be taught by experts who can impart all the advice you need. It's a dangerous sport and blackouts occur (even among experts), so you need to learn about such things and be part of a group. NEVER DIVE ALONE!