There are many decent resources on how to "pickle" the car for long term storage. Generally speaking - most involve performing normal maintenance items
- fluids changes (most critical is engine oil, others to change are coolant, brake/clutch fluid, P/S, and transmission fluid or oil)
- check tire air pressure (flat spotting is not much of an issue, unless you have very low profile tires - those can flatspot in as little as 24 hours)
- fill up with a fresh tank of gas + fuel stabilizer fully mixed
- a good wash and good quality of wax, detail all rubber and plastic bits with a good sealant and UV protectant, clean carpet well
- battery fully charged and either disconnected (remove negative terminal) or a trickle charger installed
- add cedar chips or similar items inside to discourage animals nesting in your car over winter (squirrels, chipmunks, etc. can do a TON of damage) - I put wire mesh over the intake snorkels to prevent those little buggers from filling the airbox full of nuts in the winter.
- run the car on the highway on last time to get it up to operating temp and burn off all moisture - check for anything unusual, let it idle a bit (don't race the engine before you shut the engine down, the extra gas will wash the cylinders down), park the car - parking brake off and wheels chocked (just in case the parking brake freezes up on you)
- if needed, hit all exposed metal surfaces with WD40 or similar (even rotors just remember that you cannot drive the car until you clean them off with some brake cleaner, don't get any on the pads). Also squirt some motor oil in each cylinder before. This is a little more extreme but will lessen the time it takes the get the car back up and running.
- Car cover is hit or miss, since you are in a carport, might be better to let it be uncovered. Even with the better materials and quality of newer car covers, they will still trap moisture and dirt against the body of the car.
- Running the car once a month, same deal with the car cover - hit or miss on some cars. I have to say that I've killed two classic cars because of this. You just can't catch any problems in that short period of time between runs. Better to let your car sit the whole time and then revive it all at once. I've stored my old Celica outside on the driveway with just the fluid changes for about 9 months. Battery was weak, but still strong enough to turn the engine over - car was just fine, aside from the dirty exterior and some interior fading from sunlight.