Keep tongue from being between teeth on impact with the ball. Use a one-handed roll when proficient. Swing the ban backwards then forwards. Transfer weight from the back foot to the front foot. Step forward with opposite foot to the throwing arm.
Hand follows through in the direction of the roll.
Hand follows the ball during the bounce. The forearm is a fixed pivot. Bounce the ball in front of and slightly to the side of the body. Flexible wrists absorb the rising ball. Bend over slightly.