Hi, I live in Woodinville, but I'm not sure about the laws pertaining to employment at age 15. I met a girl working at the CVS in Woodinville, she's a senior at Woodinville High School. If you're not old enough, you can try for babysitting and other types of home services. Maybe post an offer of your services on the Bothell and Woodinville neighborhood sites.
Good luck with your search.