2 Books I recommend for every beginner:
The Small Scale Poultry Flock - Harvey Ussery This author also has a website:
http://www.themodernhomestead.us/article/Poultry.html If you scroll all the way to the bottom there is a list of
excellent articles - many of which are repeated in the book.
Storey's Guide to Raising Chickens This book will give you a very good overview. Disclaimer is that a lot of the info. is from the point of view of a "conventional" flock keeper. This particular edition has added many more "natural" approaches, however. It's a good overview and worth reading.
Another book I recommend with some caution. This is a very good guide to symptoms of poultry illnesses but also gives some good first aid info (for example, how to help a broken leg, etc.)
Chicken Health for Dummies This book is co-written by the owner of this forum (BYC) and a veterinarian. I have it as a reference on my shelf and even though I'm a "no chemical input" person it is very good. [Just to clarify - I will definitely provide aid to injury, etc. I just don't vaccinate or worm routinely, etc. I believe that good husbandry is PREVENTION, and prefer to go that route rather than remediation

]