Braintan.com, will give you all he info you need, as well a Matt Richards book and video. I usualy use a mixture of liquid Ivory soap and Neatsfoot oil. 3 parts soap to 1 part oil. Also a dozen eggs will do, but does turn the hide a yellow color. No problem, if you are going to smoke it, which is the last step, and is highly recomended.
Soap & oil, tend not, to draw the flys as much as real brains. One drawback, if your going to make clothing for hunting, the Ivory soap leaves the hide smelling fresh and clean, like the proverbial "spring day". Hopefully a good smoking session will cover this scent. The smoke is pretty powerful, and smells like the woods.
One bit of advice, it helps to have all the help you can get...
Good Luck,
Greg