Fletching is a skill that can be trained by buying logs from one of the shops at "shops" in the emotes tab and using a knife on them to make bows.
It is advised to use the highest level log you can to get the fastest experience.
Poorer players may wish to continue to make yew bows even after they are able to make magic bows as the magic logs could prove a significant investment for some.
Logs are level 1, oak logs are level 20, willow logs are level 40, maple logs are level 50, yew logs are level 60 and the magic logs are level 80.
You can sell the bows to the general store at "skillz" in the emotes tab.