Unfortunately for you, there is a myth that all fourteen-year-olds are unemployable.
You could make a start trawling around your local shops. Take a brief CV and provide a couple of references and see if they'll keep your name on record if they have no work for you. Try the local market traders as well. It's hard work, and they're always on the lookout for someone who can stay the distance.
Get a couple of books from the library and learn how to write a CV, then create one. It's not hard to do and it's never too early to start.