We had a questionnaire, things like smoking or no, guns in the house or no, pets - what kind, etc. Everyone in the group had a copy of everyone's answers, so you could choose based on what met your needs. While individuals could work out different plans, usually, if it was during the day, the kids came to the sitter, at night, the sitter went to the kids. You didn't HAVE to take the sitting job if you didn't want / it didn't work out.
We had tokens, and everyone started with so many. To get more, you had to sit for someone. Tokens were good for 1/2 hr time periods. We rounded down if it was before the quarter (or 3/4) hour, up if it was after it. If you have a substantially larger family than your friends, you might consider giving double tokens, etc.
Just some things that I remember from ours. Hope it helps.
at 1:16 PM on Dec. 14, 2008