Reddit reviews Learning to Fly Helicopters

The FAA Rotorcraft flying handbook (which is available for free to download) and "the Donk" aka "Principles of helicopter flight" by W.J. Wagtendonk are two books that you will likely encounter during your training and that are commonly recommended.

However, if you aren't attending a flying school yet, I highly recommend
Learning to fly Helicopters by R. Padfield (non-referal link)

The great thing about this book is that it is very readable - unlike the two mentioned above, which are more like school books.

You can hand it to your parents or partner when you are done with it, and they will be able to read it easily, too. It covers the basics very well without getting too technical, and it clears up a lot of the misconceptions the general public might have about helicopters.

I found this one extremely easy to read, and it for sure came in handy.

http://www.amazon.com/Learning-Fly-Helicopters-R-Padfield/dp/0071577246