1) about 6-800.
2) do you need every weekend or only some? If some weekend, than some nanny are ok to prorated it.
3) my fren pay $50 per night. If bring out to pororo park paid by them, you should be happy, mean they really dote and treat them like 1 of theirs. Some of my friend do not like, more protective than no. So it's personal preference.
Roles:
Depend on age? Make sure they ate well for lunch, stay clean, and have nap.