If you're a Bow build, stamina is your best friend. Spending most (if not all) your attribute points in stamina isn't a bad idea. Honestly, all of the bow skills are great. Snipe (everybody's favorite), Poison Injection/Venom Arrow, Bombard, Magnum Shot, etc. Expert Hunter (Fighters Guild skill), Cloak, Grim Focus, and Reaper's Mark are other skills to consider trying out in addition to the bow abilities.