What color is the car? A red or black car will need to be waxed more often than a white or silver/grey car.
The best thing you can do is use a sun shade, wash and wax the car once a month, and use an Armor All-like product on the plastic and rubber parts once a month. If your car is white or silver, you might be able to go longer than a month between waxing, but keep a close eye on it so you can see when water stops beading. As long as you always wax it before the water stops beading, you are doing all you can to take care of the paint.
…and don’t go crazy buying the most expensive wax out there. Cheap Turtle Wax seems to work just as well as any other wax.
I recommend against tinting your windows. It’s likely your windows already have a UV coating, and I like to be able to see around me at night.