Babysitter Needed for my Children - Full-time / Part-time

I am a recent widow and I am a Nurse with 2 kids at home. Looking at a potential job change that would allow me to be able to care for my babies more and need help overnight. We would prefer someone who could help out with light housekeeping. We would prefer a nanny who has their own car, who does not smoke, who is comfortable with pets and who is CPR certified.