Yew longbows are your best bet until you can get magic logs.
Easy to sell in Camelot, because like mentioned above alchers are constantly buying them.
You can buy the yew bows (u) and bowstring to 99, you will make 92 gp profit off each bow you make.
http://forums.zybez.net/runescape-2007-prices
Im already 99 Fletching im just looking for profit right now tbh.
for the amount of hours you will spend to make 1M it's not even worth it. IMO don't even bother. go farm ranarrs that's way more profit for way less work.

