Unsure about interview

So I’ve been discussing a position with a family recently and am new to nannying. I’m choosing to transition from daycare teaching. I have experience in daycares with young children as well as occasional babysitting jobs. We have a meeting coming up to talk more about the position

The family needs 2 days a week, each 10 hour shifts. 2 kids aged 2 years and 7 months as of the start date. Both parents will be home but working.

I’m unsure what to charge, as well as what are the best questions to ask the parents during the interview to get a good sense of the position? What are some important things to know?