Nanny Needed For My Children

I am looking for a very flexible sitter who would be availble during the day for occasional appointments as well as someone who could be on call almost anytime due to the nature of my job. A random on call period would be only once a month. I would prefer someone who could help out with meals and light housekeeping. I would also need someone who has their own car, who does not smoke and who is CPR certified.