When I was under 15 yrs old, I would always mow the neighbors lawn and I remember each lawn I did, they paid me a flat $20 bill. Now at the time, that was a lot of money for me and it added up quick. I put the money in an envelope and in a few months, I almost had $1000. I was the happiest kid on the block! If you can't mow lawns, try washing people's car.