couple of NCL DAwn questions for our upcoming cruise on Norwegian DAwn.

I'm traveling by myself with 4 girls under the age of 16, two are 10 yrs and two are 16 any advice and tips while we are on board?

1. Is the iconcierge worth it?
2. Any cost saving tips?
3. Does NCL serve free room service like our Carnival cruise did or do we have ways of being able to eat in our room for free any nights?