Alright, first you want to find a good place to store it. Preferably (sp?) somewhere enclosed, but at a minimum you want overhead cover.
You also want to have a car cover, whether your car will be in an enclosed area or not, dust will still get all over it, so car cover FTW. If you are storing in a non-enclosed area, you want more than just a normal car cover. Best bet is to get the custom car cover for your car (
Car Cover Civic - $168.98 $168 ) and some large tarps. Cover the car with the cover and then wrap it with the tarp.
You want to put some air fresheners in your car, preferably something with a nuetral smell, not so much to MAKE the car smell good, but the keep your car from smelling stale.
It is a good idea to put your car on jack stands, resting on the frame, to keep the springs from settling as much. You can also remove the tires and store them somewhere they will be less likely to encounter moisture. They should be stored laying on their sides.
You should get an oil change as close as possible to the time you will store the vehicle.
When you store it, try to run it so there is very little gas, the less the better, also adding fuel stabilizer helps.
When you return to get your car out of storage, get some fresh gas, high octane, and a fresh oil change.
Disconnect the battery, and completely remove it from the car.
Thats all I can think of for now. If you have any questions feel free to ask.