Ok first if u want to get good magic and fletch exp u have to have 1.9m or more,55 magic,and to be able to fletch yew longs.Ok What u do is use your 1.9m to buy 2k of yew logs,2k of nats,2k of bs*bow strings).ok start to fletch your yew logs into yew longs (u) then u turn all of it into yew longbows. ok now u can hig alch your yew longs and get 768gp each.When done u should have back to 1.9m or maybe more u started with.Repeat this step to get a very high fletch lvl and mage.