Ok first off You need a knife And about 100M cash.
1.Buy round about 100 Normal logs and cut them into longbows you should be about 35-40 at this stage
2.then 100 willow logs and cut them into longbows you should be 50-55 by this point if not buy more.
3.Buy 200 maple logs and cut them then you should be 65 ish
4.cut 200-250yew logs then you should be round about 80
5.Lastly buy 1000 Magic logs and cut them and you should be round about 99-100 if not cut a few more
Total time: 1hr - 2hr (depends how fast u clik)

The number of logs may not be correct but i estimeted how much you will probally need
(Since ive got 100 fletch 2 times)

Have fun fletching!