OK, Change the oil and check the valves, also check the oil level in your transmission, just for the hell of it. At the same time, check the level of brake fluid in the reservoir, just to be safe.
Then add gas stabilizer ("Sta-Bil" works well) to the gas tank for the size of tank you have, then fill the tank to the top with gas and cap it for the Winter. After filling the tank (and with the stabilizer already in there) drive it for 5 minutes or so to make sure the stabilizer is in the carb float bowls and throughout the fuel lines and passages.
If you're worried, you can get some cylinder fogging oil at a Marine Supply store and use it in your cylinders per the label (it usually takes a short blast per cylinder, but it's more effective if you blast each cylinder for 2 - 3 seconds while you're turning the engine over via the starter - remove the coil wire first). Do this AFTER you've done the 5-minute run with stabilizer in the tank, and just BEFORE you cover it up for the Winter. In the spring, it should start right up.
Some people disconnect the battery and bring it inside where it'll stay warm during the Winter, putting it on a trickle charger every other month or so. If you do so, make sure it is sitting on a non-conductive surface like a piece of wood - they can discharge right through a concrete floor.
Don't worry about the tires flattening on the bottoms - that went away when tire manufacturers stopped making nylon ply tires. Just put it in a good spot in your garage where you can get in and make engine noises every now and then to feel like you're at home.
Or you can do what I did - buy a house down South and go there for the winter!
Gordon
One of the Nomadic "Speedstah Guys" from Rhode Island