Galwayhoop has a point about too much emphasis on formations at lower levels. 442 is simple. like you i was accommodating my players strengths by setting up a 352 (3 good backs) and the rest of the team(s) seemed to pick it up quickly and understand it. my wingers tend not to be technically good enough to be attacking fullbacks so, again, it suits.
It would probably be worth your while doing a Kickstart course with FAI - takes a day & a half and will give you confidence in setting up trainings ~ although its aimed primarily at under 10s coaching etc it does give you the basic structure on how to organise a session and how to explain the theme of the session to players which translates to any agegroup's training.
some useful sites for you to adopt or adapt drills etc
http://www.finesoccer.com/finesoccer_drills_archive.htm
and some excellent videos (some are real old school like the Coerver ones and Arrigo Sacchi training Italy prior to WCup USA'94)
http://www.totalvid.com
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