Looking back, I think the best and most economical way to become a Thunter is to be an apprentice in an operation managed by an experienced group -NOT YOURS. There, learn all you can. Also master the THAPI and VISMIN codes first so that when you encounter a marker or sign you will understand it. Of course, NOT all signs/markers are written there or the interpretations are correct but some are accurate. Also, read the book, "GENERAL YAMASHITA's DREAM BOOK.... " by Aquila Chrysaetos. You can pick many good ideas there. But most important of all, read the previous posts in this forum. There are treasure trove of ideas here from experienced hunters themselves that will really prepare you for your Thunting activities. Finally, remember that Thunting is just a hobby, maybe an expensive one, but a hobby nevertheless. Unless you're a son of Bill Gates or Jack Ma, etc. with nothing better to do, you should have a steady income for your personal/family needs.
Having said that, Welcome to the exciting world of Treasure Hunting! Be safe always!