H.F.
We pay $5 per hour for teenagers (for the first child and $3 for additional) and $10 per hour for adults. I assume that a daycare teacher would be an adult. In that case I would ask her straight out if she would like you to provide lunch or if she wants to take care of that herself... I would think most adults would take care of it. If she is a teenager then yes you should provide lunch for her, or have something she can prepare.
There is really little reason for a sitter to watch TV. Do you watch TV while taking care of your son... I don't see how to... my girls wouldn't let me. If he takes a nap that is another story and you can make that clear to the sitter before she starts. I came home one night and our sitter was watching TV while our 2 yr old was screaming in her crib and our 8 year old was making a huge mess because she was "bored". That was the last time she babysat for us. We were only gone for one hour.