Redwasp, A couple of things to think about. There are several ways to work with rock. Each is it's own art form and have differsnt ways to go about making your point. If you intend to make arrowheads and eventually blades and knives out of flint or obsidian I suggest you use spalled rock or nodules of flint and learn by practicing to make your own by thinning. If you are having problems you do need to get with someone to get some pointers. It will take about five years off the learning process in about a month. If you arn't near someone you can get instruction tapes that you can learn almost as fast. Let me know what you want to do and I could give you some honest suggestions. I don't sell them so it will be honest. As far as using slabbed materials. I agree with Cowboy by conserving raw materials especially when you get into some exotic or rare rock. But in doing this you have to learn to prepair and flake the preform differently than you would the old way. Two tapes I would suggers are, If using slabs for arrowheads ( Lap Knapping, with Craig Ratzat), if using raw flakes for arrowheads (Making the Cahokia and Ishi Points, with Jim Redfearn. Good luck, be glad to help just email. Sleddman