where can I get arrows? (Far Cry: Primal)

Just started the game.
Made a bow and drop arrows to him.
Shoot at the deer.
If I hit the beast -- then I boom it out. If missed-as good as the arrow is lost -- can't be found.
Because aim for the head (like headshots!))), and the level of the game-initially hard, then boom quickly lost.
HOW TO DO THEM???
The tree and the reeds are harvested, they have a lot.
WHERE the option"make arrow OR something LIKE THAT???