First order of business is gathering fuel. Doing so will warm you up so you have steady hands to actually start the fire later on. Plus, it will be harder to find once it's dark. How much? For an all-night fire, a stack of logs as long as you are tall and waist-high. With an ax, you can lay in a supply by toppling one standing dead tree. No ax and you'll have to haul in deadfall and break it into reasonable lengths by wedging the ends between two trees and pulling. Don't neglect burned stumps, which are full of pitch, and for every three dry logs haul in one green one. It will burn once the fire is established.