i am 14 and have recently been job hunting. i have been to several hairdressers who have taken my CV. all you need to go to is small shops/ hairdressers (someone i know who is 14 works at a dry cleaners) ask if there is any under 16 jobs available (politely!) if so then produce a CV which was written carefully and wait for a response. dont forget to say thank you for your time or sorry for the interruption etc. however, if there is absolutely none try baby sitting or pet sitting. Even a paper-round, washing cars or sorting out people gardens gets you some cash so try anything and everything you never know until you try.
good luck!