Never expect from a kid what they are not capable of doing. Be a good listener. Don't treat all players alike. They come in different degrees of competence. Good coaches don't over emphasize winning.
Good coaches use age appropriate coaching.
A great coach should provide inspiration and encouragement to his team. He makes himself available to his players for whatever problems they have, whether in sports or in life. He should not stretch the truth and accept mediocrity. A great coach will push his players to greatness and soon, the players will come to expect intensity, dedication, and good performances from themselves. Great coaches inspire players to improve and grow better as players and people.