I am a very responsible 12 year old girl, who loves kids. I took the babysitting class at red cross. I help in my church nursery Fridays and Sundays. Everyone always says how good I am with kids! How can I ask some of the parents when they pick there kids up from church if I can babysit the kid?

You could make a flyer with your information/courses/experience and hand it out to the parents when they pick up their kids.