Joe, I have made exactly one knife handle, for an old hunting knife. It's not too difficult. Find some material for the scales, wood, micarta or something else. Assuming the tang is an extension of the blade, trace the tang outline on the scales and roughly cut them to size, leaving some extra for final shaping. Drill holes for the rivets in the tang and the scales so they align. Using epoxy, glue on the scales and insert the rivets with copious amount of glue and clamp. When glue is dry, start shaping using rasps, files and sandpaper. When happy with smoothness, apply finish of your choice and start cutting with your new knife.
Roy G