One of the basic fielding drills that our kids use is called the "Soft Hands" drill.
We took a ping-pong paddle and cut the handle off and stapled a batting glove to the back. The player puts his glove hand in the glove and fields ground balls from a fungo. The drill emphasizes the use of the top hand, to ensure the ball doesn't become loose and so that the throwing hand is there to throw or flip the ball.