When I was your age in (1997) I applied at a fast food place within walking distance, it was Subway.. I did manage to make enough money in a month to build a basic computer that costed like $500 and started upgrading it whenever I could. I was making about $100-120 a week $5 per hour.
If you are more outgoing than I was I would probably mow lawns and shovel driveways you can get pretty good money quickly doing that, I would probably charge $50 per acre if I was mowing lawns and probably $15 per 100sq FT shoveling snow.
Right now I pay the kid who mows my lawn $100 a week for about 75% of an acre, but I'm pretty generous compared to a lot of people near me.