Make sure your shafts are in-line fore and aft, and your feathers are from the same side. A jig will help keep the feather oriented. Don't give up, most primitive arrows were made without a jig. That being said, buy or trade for the best you can afford. I have the Bitzenburger, it has clamps available for right, left, and straight Fletches, it is rather pricey, though! Good luck! Keep practicing building and shooting!
Hawkdancer