Use various types of releases. Place small target on ground. See how many can times the target is hit out of 10. Practice pitching to actual batter. Keep a balls and strike count for each.
Fielders practice fielding hit balls and return to pitcher.
Hitting Slow Pitch Technique Feet shoulder width apart and knees slightly bent. Grip bat so middle row of knuckles line up. Keep hands shoulder high and away from pitcher. Take slight step with front foot. Contact point hips square, arms extended, eyes focused on ball.