Heres a
LINK to put you in the mood for whats to come. Note what some of the RVers do with there coach for the winter months.

If your going to live in it you may want to add a blanket if insulation on floor of water bay.
You will have to fill fresh water tank and not have any drain or water hoses exposed and close all access wholes into water bay. The ice maker tube I would drain and buy some ice, disconnect the 12v's to heat tube its been known to melt the tube and cause leaks.
If you have a heat vent from furnace like some of us do you may have a fan that operates when the furnace cycles off and on. My coach does have that feature and a switch to shut off fan in summer months. Some tanks come with heat pads under them maybe 12v or 110v pads.
If you are just going to winterize follow Robins advice and your service manual for your coach.