I think at your age, it would be better if you looked for some youth employment program in your area and register for a suitable position. You can get work at the stipulated areas but you might also consider tutoring your minors or baby sitting.
You could try dog walking or running errands for the elderly. The elderly have so many needs! They need all kinds of things done. You could also start your own lawn service. See if your church has anything you could do.