I am a 12 year old girl who needs a babysitting job I am good with newborns to 7 months and children 5 and older.
PLEASE HELP!

Make up a flyer and post it in your neighborhood. Inform you neighbors with children that you're available to babysit.

If you belong to a church then you can advertise there with your parents permission. Another thing your going to have to decide is what your rates are going to be like. You need to set rules for everything. Also if your in the U.S. or Canada you can take a course to become certified for babysitting from the Red Cross.

Ref:

Caregiving and Babysitting

Babysitter’s Training

This course gives youth ages 11 to 15 years old the knowledge and confidence to care for infants and school-age children. Combining video, activities, hands-on skills training and discussion for a complete learning experience, Babysitter’s Training teaches youth how to: Respond to emergencies and illnesses with first aid, rescue breathing and other appropriate care
Make decisions under pressure
Communicate with parents to learn household rules
Recognize safety and hygiene issues
Manage young children
Feed, diaper and care for infants
Start their babysitting business

Course length: 6 1/2 for core course; program offers a variety of additional topics that can be included in the training.

Im 12 year old Girl and AM great with BABIES ANY AGE INCLUDING KIDS!! In Texas Anybody need me 2 babysit? I also work in the Baby nursery Sundays 10-12 and can Change diapers,Feed,hold them,Bath them, and anything else I went to a safe sitter class and know everything about a baby/Child. :)

You posted this as a answer to another persons question. Next this is not a classified ad area. People from dozens of countries all around the world come here. If you want to ask a question about how to advertise, or good ways to watch kids, please ask