Welcome to irv2.
should give you all the answers for winterizing.
This link will give you info on how your BIRD System
will mauntain all your batteries if you have your shore power cable plugged in.
As far as jacks you can set them your in a housed area if it was outside would leave them up and inflat tires to Max on sidewall than reset pressures to your loaded weight
for the tires you have in the spring..
Once you have it winterized, no need for heat in coach.
Congrats on your Newmar, many safe travels.