I think one rifle and one sidearm is the bare bones of what you would need. I personally think that a 223 rifle is the best choice. You can find ammo and parts everywhere, most people have them so you will be able to find more supplies. As far as a sidearm is concerned, I would go with a 45. I have a Glock 21 Gen 4, with some upgrades to it. I love it. It has a great balance and 13 plus 1 rounds. 9mm are great and easy to come by. Either choice in caliber is a good. You can’t go wrong with either one. I also have a 9mm with all the extras that my wife carries. If you have room or you can carry around alot of weight I would also suggest a pump shotgun.