Mr Larry Hodges, who has posted here under the nick 'ttworld', has recently written a short guide for US coaches to use when training Juniors (typically, anyone under 18 years old).
Larry is the webmaster of the US Association for Table Tennis (USATT) and has written a book on TT-technique.
Here's the link to his guide:
http://www.usatt.org/club_programs/j...g_primer.shtml
Particularly interesting are sections 5 and 6.
Zachary