I have yet to see a T-ball team where you could not get a father or even a mother to help out on the field. Basics is the key. Paying attention, throwing catching, where the bases are and did I mention paying attention. We used to do the fun drills of timing them while running the bases properly or throwing baseballs to a target and counting how many hits out of 10 throws. Make it fun. I have not seen many book dedicated to T-ball. Just make it interesting for them so you can keep them coming back next year.

Use the time in Tball to get them ready for the next league. When they leave tball they should be able to do a list of things:

field ground balls, catch fly balls, throw, run the bases correctly in order, know what is a force situation or not, bat without throwing the bat for starters. Our league introduces coach pitch after the halfway point. Each batter gets 3 pitches before the tee is put back up. Make up a list of things that are important to you to work on during the practices and games. At this level there is little difference between games and practice.

Fogball

If you are a "serious" baseball coach, then T-ball can be a difficult adjustment.

Try to remember one thing: you're not coaching a baseball game. If you think you are, you are likely to become quickly frustrated.

That doesn't mean skimping on the fundamentals -- but it does mean toning down your expectations. They are 1 or 2 years out of diapers, don't expect them to win the World Series.

It's more helpful to think of it as hosting a baseball-themed birthday party twice a week.

YYMV - especially if you live in TX. Where they do have a World Series.