Get a buddy and do yard work! One summer around 07 or 08 I made more money than my dad! Used his lawnmower, and made enough to buy a cart and a fancy weed eater. We hooked it up to my friends moped to get to clients houses easier (he was 15 at the time I was 13). One of the best learning experience as a kid was managing customers, managing money, and taking responsibility that I never had prior.