JOBs FOR 15 YEARS OLD

I'm turning 15 tomorrow and I wanna get a job to help my mother out ( she's a single mother and my "sperm donor" doesn't help her out at all , I also have 2 more siblings ) so I wanna give her a hand by getting a job it could either be after school or weekends.. Anyone knows any jobs ? For a 15 year old ? Also can I even work if I'm only 15 ?