Yes, 12 year olds can babysit.

Yes

Have you taken a babysitting course?

That's a good idea. Most parents prefer someone that's at least taken a course. Look in your area to see if there are any courses available, and when.

Then you just have to find customers. :)

Make some small signs on 3 x 5 cards or your computer and put them up at supermarkets, pet stores, and telephone poles.
Make a list of local emergency numbers also on a card to show that you are prepared, and think about all the ways you can be good at the job - experience with siblings or relatives or neighbors, basic first aid, (I assume you haven't had a CPR course at your age, but you can learn about choking). Offer 3 rates: just being there while doing homework, full time attention to the children, and cleaning house at the same time for the highest rate. Maybe an introductory rate for the first 2 times. Talk about how you are doing in school, how you help out at home, any skills, hobbies and sports. It's GOOD to brag when looking for work. Good luck.

But have a parent take any first phone calls and screen the caller. There's that small chance of the wrong kind of person answering an ad.

I am also a 12 year old looking for a babysitting job.I think that babysitting is a good thing to help your future and if it is your dream follow it.