ArcherII
These two sites are useful:
FAA Flight Instructor's Handbook
Helicopter tutorials
If you want to buy a book, I'd recommend:
The Helicopter Pilot's Handbook by Phil Croucher, ISBN 0-9681928-3-1, published by Electrocution
or
Cyclic & Collective by Shawn Coyle, ISBN 0-9726368-0-3 published by Helobooks
I wouldn't usually recommend the second book for someone who's not yet taken a trial lesson but, given that you know quite a lot already, it's worth considering. It's commonly known as the 'helicopter pilots bible'.
Book reviews
here