Grizzly bear. Most of the sheath stuff I just learned from trial and error. If I could give you any sheath advice, get some decent tools. A nice straight line with an gouger and evenly spaced stitches by using one of the stitch layout wheels, or whatever they are called, can go a long way. Also, get some good oil dyes, or at least the alcohol based ones. I have not had good luck with eco-flo, but maybe that is just me. Finally, get quality leather. I guess the best advice I can give is to enjoy it. I used to look at sheath making as a necessary evil, but now I look forward to trying to make the sheath match the knife as well as I can. My sheaths have improved the most when I dedicated the time to making them and did not just try to throw them together last minute in order to get the knife out the door.
Hope this helps.