There are many different factors that come into play when you are learning to throw a baseball. Some of these factors are the grip of the baseball, the proper throwing position, the delivery of the throw, the follow through and other throwing mechanics.
Learning to grip the baseball correctly is a key to throwing well. Grip the ball firmly but not tightly. You are not trying to choke the baseball. You want to place your thumb under the baseball and your forefinger and middle finger on top of the ball. Place the ball on the fingertips and not deep in the palm for greater accuracy and control when you throw. Make sure your fingers and thumb are across the seams and not placed on the seams. This placement helps the ball stay on a straight path. As you get more experience, you will be able to throw with the seams to get additional movement on the ball.
The proper throwing position requires you to square yourself to the target. If you are right-handed, you want your left shoulder pointed at the player who is going to catch the ball. The instep of your right foot should also be facing your target. Raise the ball to ear level. If you are left-handed, it should be done in the opposite manner. Make sure your elbow is higher than your shoulder. You are now ready to throw the baseball.
The delivery requires you to keep your eyes focused on your target as you begin the throwing process and keep them there throughout your delivery. Step with your front foot toward the target, beginning the transfer of your weight from back to front. As you step forward, bend your front knee and bring your arm forward. As your arm gets into an extended position, snap your wrist forward and release the ball. Your middle finger should be pointed directly at the target, allowing you to have greater accuracy and velocity on your throw.
The follow through is when you continue moving forward with your arm after the ball has been released. Bring your back leg around so...