Good and helpful answers above.
I would suggest the following, although not perfect, at least it is a start. It is just to give you an idea of how an ad might be worded.
Baby Sitting Service Available
Caring, compassionate, responsible and available during hours to fit your needs.
Rates (Your choice. Per week, days hours or whatever.)
Please call (your first and maybe your last name) at 555-1212.
Address: (your address)
References provided upon request.
Then you have the little pull-off tabs with your name and phone number on them.
You also might like to consider advertising on the Internet. It works great for the businesses that I have. I have listed many sites where you can list for free on the following link:
https://www.askmehelpdesk.com/music/...tml#post471334