Use Lara's instinct and you will notice three golden poles that point to the locations, where you will find resources. To collect them, approach the withered trees and while standing by them, press the X button. Nearby, there is a dead deer. Approach it and collect the third of the materials. At this moment, Lara will witness a pack of wolves dashing by. Before you walk deeper into the forest, you need a weapon, not only to fight off animals, but also opponents that will soon venture by your camp.