Hi Psychic,
as mentioned above - welcome and good luck...
I have to totally disagree with Toby (remarkable that I would disagree with someone

), but I give a VERY DETAILED briefing with the ENTIRE team before every match. I have found that preemptive management BEFORE the game starts makes my life MUCH easier during the game.
I deal with:
- front rows: CPTE, bind, body position, hooker's feet and purposely wheeling
- S/H: when the ball is out of a ruck, feeding, staying behnd the ball at scrum
- F/H: maintaing offside line at scrum and LO
- ALL: quick taps, expectation at breakdown (release and especially offside lines)
- skippers: discipline and remind all that only captain has opportunity to clarify - not question
I then invite any questions...normally a couple...
This whole process normally takes no more than 2 or 3 minutes - and I have found it HUGELY beneficial. However, this is only MY approach...different things work for different people..