Theres alot of good advice up there, but one thing I havent seen and maybe I'm just a freak for doing it, but once you've found the deer and they're in range, you manage to get a full draw, I always aim for the lower 1/3 of the body. Had an old timer tell me to do so after I over shot my first three deer. He said that the deer hear the arrow whizzing at them not just the bow.

Another thing I've passed on to a buddy thats taking up bow hunting for the first time is "Get ready to make at least every mistake in the book". I think I did, twice.