Fly Fishing: "Fly Fishing 101:Starting The Fly
When you start a fly always cover the hook stem completely making sure to double up on the back of the stem near the curve. When finishing, always make sure give yourself enough room to tie it off using a finishing knot. This is especially true for the novice fly tyers, you will want to add dubbing, feathers and hair to the whole stem but you need to make sure you don't cover the eye of the hook.
Your finishing knot should be a simple over under knot, similar to a clove hitch or a doubled overhand knot. Instead of buying a finishing knot tool that they sell in fly fishing product stores, take a large feather (I have found turkey to be the best), and cut off the last three inches of its base. Where the feather would have connected with the birds flesh there should be a small hole.
Fiy Fishing 102:The Hook"