I personally don't like support pins, if you use them, be very gentle with the frames, otherwise the pins will break thru the foundation. I also find that if the bees are not in the building comb mood (no flow) they tend to chew out the foudation around them. Since you are a beginner and most likely don't have the equipment to install cross wires, I would go ahead and use them. Just make sure you feed the bees syrup so they can drawn comb, and you should be all right.
You can store foundation in the house as long as it is not too hot (don't leave it in direct sunlight). Wax moths will not bother foundation. They will only eat comb that has had larvae or pollen in it.
Not sure what you mean by medication, but you should definately watch for varroa and I highly recommend treating for tracheal mites. I'm a strong believer that a lot of the so-called "starved" winter kills are caused by tracheal mites.