Pitching is perhaps the most challenging aspect to coaching children. The most important thing to remember as a coach is to pace how fast a new pitcher is taught; only so much can be absorbed at a time.
Control vs. Speed
Many children want to throw fast, but be sure to let them know that throwing quickly will come after they have mastered technique.
Arm Angle
At the pro level there are pitchers with a huge variety of angles, but they remain consistent. Inconsistent arm angling is very common at young ages and while the specific angle the pitcher throws isn’t all that important, becoming comfortable with one angle is vital.
Leg Strength
Pitching is in the legs, not the arm. Be sure to have the pitcher run and do sprints to loosen up and strengthen those muscles.
Follow Through
Proper technique means pushing off, bending the back, and following through. Many young kids simply do not do this, which is potentially harmful and could lead to arm and back injuries if the habit isn’t broken.
Grip
Teaching kids different grips should come after technique is mastered, and the grip a kid uses isn’t all that important. Consistency in the grip used is, however. Tell a pitcher to use the grip they are comfortable with and stick with only that grip.