Nanny recommendations in Plano?

I am getting ready to go back to work after taking a year off to be with my first child. Based on the hours I'll be working and that my husband works, we believe we will need a nanny. Do any of you have recommendations of the best way to find one?

What hrs would you need a nanny?

I know a woman whose nanny is looking for some other part-time work...Just let me know if you'd like the specifics.