From a business standpoint - I am interested to offer more than just the regular day hours of care, seeing that there is a need for evening/night care (no week-ends - they're my official rest days, and time away from children). I don't have children of my own, btw.
I don't know much about this.

I'd like to hear all sorts of viewpoints about this, advice and cautions, experiences, etc.., Also how do you charge rates for this kind of service?