I personally am so terrified of babysitters. I went to Mexico for two weeks a couple years back, my son was 3 at the time, hired a sitter for when my husband was working. The girl was 16 years old, and she took him to a skateboard park, and let him ride on a skateboard. I came back and he had a huge gash over his right eye. This girl had strict instructions about where she could or couldn't take him who she could or couldn't have him around and so on. She was only allowed to take him outside around the courtyard of our apartments and no further, she violated all of my rules.
Anyhow, there are agencies around Indiana that can help put you in contact with certified babysitters that don't charge a whole lot. First call for help sent me a list of sitters and I went nad interviewed some sitters, and finally found one that was just fabulous. She was wonderful, took great care of my kids. I paid 72 dollars a week. Her husband started having some medical problems, and she had to stop sitting for a while. And i ended up having my husband's ex wife babysit my 5 year old during the summer. I only paid her 50 a week. She has four kids of her, two of them my step children. She also takes great care of my son.
The best options are to either call a local agency that can provide a list of child care providers, you can call the local trustee and ask them if they know of such agencies, or you can call the local wic office or welfare office, they should all be able to direct you. Or you can find a stay at home mother and maybe talk to her about watching your children. Some teenagers are responsible, most however can easily get distracted or bored or talked into making some not so good decisions.