if its gonna sit. jack it up on blocks, my car sat 6 months and i found that two tires deflated on three occasions (granted it was outside too),
fill the tank to the brim untill there is no more air in there at all, more air = more condensation that turns to water in your tank. put some lucas stabilizer in there and some 5w30 or so weight oil so you can cold start it and have the lucas smother all your parts so you dont crank a dry engine.
clean the car as best as you can, just go through and empty anything that is semi organic, dont leave air fresheners in there, buy a box of moth balls and scatter them all over the interior of your car , seats, glove box, hatch everywhere, hell my car was covered under roof and car cover so i put some dixie cups with moth balls in my engnie bay too.
fill your tires with air, check the psi cus ya dont wanna find one flat and have it crease or something, warm the car up twice as long as you would normally and keep the battery you use charging or in use on another vehicle, its incredible how fast that car will suck a battery dead, i went through 3 FULL charges in my winter cus i left the car connected for two weeks at a time. best if you take the battery out and use it in your winter car that way spring comes arround the battery has still been in circulation and you dont have to deal with the shit i did of having continuos dead batteries.
wash the hell out of it and polish it 6x over, these things seam to attract dirt when they sit. and yea use some stabilizer or some high octane just make sure its totally full. and when spring comes arround go REALLY easy on it and run it dry and fill it up again and put some injector cleaner in the sucker and change your sparkies and your good to go.
i found its just as much work to keep this car sitting still as it is to keep it running.