Archers use leather armor, right?
If so, then you can pretty much ignore stuff that has to do with cloth(ie, cloth extraction)

Focus crafting allows you to make the ranged weapons of the game, discs, bows, staves, and whatever mystic uses.

To make focuscraft items, first buy the desired reciepe(given enough skill in the craft) and then obtain the ingredients of that reciepe.
So far(for me) the reciepes have followed this pattern:
X of an item you craft(not sure if you can buy it)
X of an item you buy from the supply npc
X of a different item you buy from the npc
X of a rune that you get from random monster drop