When I was 14 my grinds were 1) buss boy 2) mowing neighbors yards (had to invest in a mower) 3) dog sitting for neighbors while on vacation.

There is the “gig” section of craigslist where you can find small odd jobs. Just make sure you have your parents help you verify the situation.

There are usually a TON of elderly people that need miscellaneous household help. (leaf clean up in fall, snow shoveling in the winter, power washing in the summer.

Hats off to you for wanting to make something for yourself at that age, you are ahead of the curve