LOL...
Actually I do know a good book on the Apache, it just isn't finished yet!
In all seriousness, there are a few good books out on the A model Apache, but there is a desperate need for a new book that covers both models. I'm writing one for Osprey right now that deals with the Apache in Afghanistan and Iraq. It should be out in about six months if all goes well.
As to how I know this stuff, well... I got into military history when I was 3 years old and my grandfather pulled out his footlocker full of stuff. I was hooked from that moment. He was an infantry officer in WWII, but aviation came naturally to me. I've studied it all my life (I'm 31 now). I'm finishing my PhD in military history and will be commissioning as an Aviation officer (fingers crossed on that one!) in July. If all goes well, I should be flying Apaches by Spring 2006.
My advice, read as much as you can, talk to people, go to airshows and take LOTS of pictures. Get your hands on manuals if you can. (I've got a full set of AH-64A manuals, and believe me they're great for modelling!)
I don't know everything about helicopters, not by a long shot. But I try to absorb whatever new info I can. This forum is full of guys who have infinitely more experience and knowledge than I do. You're in the right place, just sit back, relax, absorb the info and don't stop askin questions!