Using the fletching skill, a player may make bows and arrows of better quality, range and damage than what can be purchased from a merchant.
In later expansions, quests were added to help you achieve the basic skill levels. You can choose to do "freebie" quests in either Absymal Sea or Crescent Reach. I recommend the ones in Crescent Reach.
Or, if you want to invest more time and be able to both achieve basic skill and learn how to refine ingredients for Gates of Discord Recipes, then you can do the alternate quest in Abysmal Sea.
Once you've gotten some basic skill in Fletching, you should check out the Trophy Quests offered by Event Coordinator Baublie Diggs in West Freeport. The earlier you start one of her quests, the easier they are to complete!
Don't forget to check out the great player made guides in the forum area as well.