You will need only two things -- both of them are rocks. First, find a chunk of flint (or chert, chalcedony, jasper, obsidian, etc) to break into sharp tools. Flint can often be found in and around rocky ledges, river bottoms, and outcroppings, particularly if there is limestone present. Second, find a roundish rock about the size of a small apple to use as a hammerstone. This can be picked up anywhere - creek bottoms are a good place to find nice round ones.