Hi Harvey009,
Congratulations on your new Gateway and welcome to the Heartland Owners Forum.
It's always a good idea to be clear on how to winterize and de-winterize. Make sure they show you where the Hot Water Heater bypass control valves are located and how to add antifreeze. Also, if you have a roll-around kitchen island, make sure you know how to secure it for travel.
I expect others will chime in with additional thoughts shortly.