First Time Cruise

This will be our first time cruising on DCL and first time cruising with kids. Outside of the obvious things like clothes and toiletries, what do I need to bring for my kids?

What’s dinner attire for kids like? Will I need a stroller for a 3 year old? Should I bring fidgets/small activities for meals in the dining rooms or are the restaurants entertaining to kids?

We will be on a Halloween on the high seas cruise on the Magic if that helps! Thank you!