These are very useful tips for coaching kids in baseball:
Baseball season is upon us and with that an influx of youth players
who are in need of a coach. Coaching 10 or 15 kids is not as difficult
as you may think. This year when your child asks, don’t make any
excuses. Instead, accept the position, don the hat and follow these
youth baseball coaching tips to ensure that you and the kiddies have a
safe and fun season.
Seven Important Youth Baseball Coaching Tips:
Tip #1 – Familiarize Yourself With the League – Take
the time to learn the rules and policies of your new youth baseball
league. You are going to be dealing not only with umpires and fellow
coaches, but with eager parents who already know what to expect.
Tip #2 – Be Organized – Prioritize the amount of
important paperwork you receive during registration. You want to make
sure that you have important information like allergies or medical
concerns easily accessible, while other documents like birth certificate
copies can be filed away.

Read more: http://www.dialmycalls.com/blog/b/314/seven-tips-on-how-to-be-an-excellent-youth-baseball-coach.html
I also came across with this related post: http://teachbaseball.wordpress.com/2012/01/20/pre-season-workouts-for-coaches/