Help Planning a Trip to Japan

Hey, a group of my buddies (anywhere from 7-12 of us) are planning to take a trip to Japan in late January of next year. We love to ski so would like to start at Niseko United and travel to Tokyo and mt fuji after a couple of days skiing. We live in the West Virginia/Virginia area and are about five hours out from DC and hear that's one of our best options to travel from. I need help planning this out figuring out which airport to go to and just in general the best way to go about this trip.