Welcome! You have come to the right place! Alaska is much farther north than I am used to. (I'm in southern Maine.) I would recommend getting a mix of different chicken breeds to try and figuring out which works best for you. I have found my Plymouth Barred Rocks to be very hardy birds in general, but I've also had really good luck with golden wyandotes, and jersey giants. My golden comets and buff orpingtons weren't as long-lived. Definitely have your coop and run all set up before getting birds! I'm sure you will have issues with predators there, in addition to the cold! Once again, welcome!