Welcome aboard. Where you at in NC? I do all my percussion abo-antler, stone, or wood. I use copper pressure flakers sometimes. For a percussion hammerstone, you want one that's reletively soft and gritty, like sandstone or rotten limestone. Soft hammerstones allow a slow flake initiation, letting you get longer flakes. Harder hammerstones will cause cones, steps, and short flakes. One good piece of advice that James Parker gave me about hammerstones years ago: Take the hammerstone and slide it against the leg of your jeans. If it don't grab, chunk it.
