What should my player be doing ON-DECK?

First off, your on-deck batter should be taking his/her practice swings to the back of the batter at the plate to avoid line-drive foul balls.  While on deck the batter should be watching the pitcher taking good solid strides and swings timing the ball to the plate.  He/she should also be deciding where they will be standing in the batter's box.  I recommend kids stay more towards the back of the batter's box because:  They will be able to see the ball longer, and it makes for a tougher play on the catcher during bunts or steals.  Depending on the child's age he/she should also be paying attention to the pitcher's tendencies if the pitcher has off-speed pitches.  Donut bat weights also help losen up the batters primary muscles
  Hopefully this was helpful!