[KNS]

1. weather proof will protect more (put on a clean car!). You're way ahead under the carport.
2. Battery may go flat if it sits for a while. Unavoidable if parked outside but rodents will use it for a home.
3. One a month if possible. Drive long enough to get the engine up to temperature and then for at least 20 more minutes. The longer the better. An occasional hour long drive on the highway is very good for any car.
4. Avoid doing either. If you must do a short drive on one day that's fine just try and do a longer drive soon after. Idling - Simply letting a car sit and idle is not very good for any car - hot weather or cold.
5. If you're going to store rather than drive occasionally, search in the 911 forum for storage tips.
6. Rodents, rodents, rodents. Do what you can to keep them out of your car. I have a car in a storage unit. I've spread non-scented glue traps all over the place. I found one dead mouse years ago but none since.

I had my first 911 before I got married and made it clear to my wife that the car was coming with me into the marriage. She was cool with that.