Try google and you will find articles about this subject. Golf ball diving is:
1. A multi-milion dollar business
2. Jelously guarded by those who have the contracts with the golf course and theives (non-contract) are procucuted.
3. Dangerous, yes the turtles and such can bite you thourgh the suit. Some courses have gators too.
4. As a minor, you would be hard pressed to get the contract. Oh by the way "flying under the radar" and not paying taxes is a crime. Even as a minor you have to report your income if you make over the limit. You enjoy the protections of the police, fire, and the US Military to protect you, and the schools you attend and the roads you will drive on etc and so you must pay your taxes like everyone else.