you can get a free knife under lumbridge castle in the cellar were you start the quest cooks assistant.
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Lumbridge Kitchen Dungeon.
If your not cheating, then the fastest way is to buy high level logs and fletch them. Since arrows and bows are sellable you'll be loosing only some of the money.
Buy a choc bar then use pestle n mortar to grind it up. You can also use a knife to chop
you can get one for free in lumbridge castle in the room were the cook is, on the box in the top left corner.Or simply buy one at a general store
There are different kinds of trees players can fletch on.