You could also check out this Forum board:
http://forum.brillkids.com/little-reader-how-tos-and-faqs/In particular, please note:
http://forum.brillkids.com/little-reader/the-difference-between-categories-and-playlists/For now, you can just stick to the Playback screen and just play back any playlist or category. Just go through some of them and see how your child responds. Better to keep lessons short but frequent rather than long and infrequent. But ultimately, there are no hard and fast rules. Usually I would go through about 3-5 Categories each time, depending on how long each Category was.