It depends on your area as far as rates go. I am in far North Dallas burbs and the going rate is $10+ per hour.
My 16 yr old regularly sits for a family weekly from about 6:30pm-almost midnight and gets $85 cash. This is for 1 little boy. Needless to say, when that family calls, she drops whatever plans she has and goes to babysit! Her other families pay around $12/hour.
She does interact with the children. She teaches them Spanish (this helps her practice because she is in Spanish 4 AP), she does mani/pedis with decals and gems for the little girls (with parental permission of course), she id CPR trained as well.
Shs is very responsible and makes sure the children follow house rules.
As for looking for a sitter, talk to your neighbors, our HOA has a website (private) where babysitters can advertise their services for free, talk to your friends for references.
Good luck!