I'll second the YouTube endorsement. Good info for free. The great part about knapping that I've found so far is that it takes very little to get started (I mean all you really need are rocks) and very little time to actually make an arrowhead, (most of mine so far have been from flakes, but hey, they're sharp and pointy and look like arrowheads). I've yet to knapp an honest to goodness point or blade, but I'm getting there.
I can also recommend Missouri Trading Company if you want to purchase tools or supplies. I was having problems finding copper end caps large enough for a big bopper, so I bought one from them. I also ordered a few other nick-nacks just "because"
it's all about the tools, right?
. When I placed my order over the internet, the site miscalculated the shipping charge. They immediately contacted me and asked if I wanted a credit on my card or an obsidian knife preform. I opted for the knife. I've yet to finish it, but it looks to be pretty sweat.
Have fun with it and experiment. From what I've found on this site, there is knappable material all around us, even if there is no naturally occurring rock in your area. (Porcelain toilet tanks, glass bottles, electric insulators, etc)
Otoe