jacking the car up is a good Idea but not always easy (restricted room), an alternative is to inflate the tyres to max pressure to help reduce flat spots, and roll car back/forth once a week.
Iv'e often thought about the pros and cons of starting the engine regularly over the winter. Personaly I tend not to since about 80% of engine ware accures during starting and warming up, so unless I want to use the car I just turn the engine by hand ocationaly to stop it sticking up.
I also leave one of the windows half open to keep inside aired (an old cotton duvet cover covers the whole car inc open window.)
I stand the wiper blades of of the window so thet the rubber blades do not set in the one position (so they will 'flip flop properly if ever needed).
Keep battery charged with conditioner too.
Stock......the new custom