Well, as far as I'm aware, when it comes to Crafting the Skill "Crafting" basically covers all of it; you need to have a decent understanding of the raw materials to make anything, after all. In terms of finding them...Survival should cover finding good, solid wood. As for the points...well, you need to have either iron ore, or a wicked fucking stone. The GM would decide this, but unless people have iron ingots lying around, the spears would have to be stone or wood...which I would personally argue would do less damage or be counted as "Fragile" when compared to an iron longspear.