Affiliate Marketing Secrets

I have a STRONG passion for guns, video games/pc’s/ and anything with two or four wheels and a engine.
Guns: would love to work pn and or build/design guns. Always have been fascinated with them. Could catch my inner artist with engraving and design. Note not a hudge demand so idk 🙁
Video games/pc: love games. Would like to upgrade from a console to a nice pc. Want to learn how to build/work on/repair pc’s AND OR design video games.
Engines and trucks/cars: always loved em. Since a small child with hotwheels in the sand. I love these i would like to learn how to build/work on/repair em.
What classes and which job would make a better paying and long lasting (always in demand) job trade to take up classes in college?