I'm going to assume that you have indoor storage that is not heated. First make sure that your anti-freeze is good to at least 30 below zero. Clean the exterior of the car and put a nice fleece lined car cover on. Clean the interior. Buy a Battery Tender battery charger and hook that to the battery but disconnect at least one battery cable. Check the air in the tires, if you have a slow leaker over inflate that tire, maybe it will last until spring, or just fix the darn thing. Fill the gas tank and put in a bottle of Sea Foam, that will help stabilize the gas until spring it will also clean the carburator in the spring when you start to drive it again. And for fun, put $5 in an envelope every week until you get the car out so that you can have fun in the spring!