Jeff, what you will figure out after reading Allen & Mike's book (get it from Amazon) is that you can break winter specific skills down into 3 basic categories-
1. Keeping warm-clothing and shoe choices;
2. Keeping dry-shelter and outerwear;
3. Keeping fed and watered-stove choices, cooking, making water;
the rest is similar to 3 season camping-navigation, etc.

One choice to make is skis or snowshoes. I used snowshoes then switched to skis, which for my purposes, I like a lot better. I tow a sled too-my trip reports have pics of my gear, including my sled.