There is a lot of information on storing cars on the internet, it seems many people have been doing it for decades and have learned alot over time. Here's a checklist that took me all of 30sec to find.
http://www.rochestercorvetteclub.org...-checklist.pdf
Do as much or as little of what is listed.
INJECT OIL: This can be done for rare cars and for long term storage needs. If you really want to go to great lengths and are truly obsessed, take a lesson from motorcyclists: Remove the spark plugs and inject a little oil into the cylinders. Reinstall the spark plugs (or an old set of used plugs for storage) without torquing them completely, and crank the motor briefly with the plugs in and the positive lead to the distributor or the coil wire removed. (Don't let the engine fire.) This will coat the combustion chamber and cylinder walls with a protective layer of oil. Don't restart the car until spring. You will need to change the spark plugs back to your good ones or buy new ones in the spring because of the oil that fouled them with the protective layer.