Why dont you start by doing paper rounds/delivering magazines/brochures etc etc? Small jobs like that will lead you onto the big ones. It is pretty tiring but hey, you get some experience and money. Continue volunteering/working in charity shops as those are good too. A lot of jobs these days require you to be 16+ but good thing is you don't have that long to wait. Just keep doing small jobs here and there until you can properly apply for a job. If you have a family business or your relatives or friends own places you can work there. You can mow lawns, wash cars, take dogs for walks, stuff like that. Good luck!