So, you have decided to do a little reading about Chessie Model Railroading. Here are some of the references I use. You don't need to buy all these books, I have found most of the modeling books available through Kalmbach publishing at my local library. Try your local library before you go out and buy a book you may not neccessarily need to buy.
Painting and Weathering Railroad Models, by Jeff Wilson, 1995, Kalmbach Publishing. (Great how-to book. Perfect for the beginner.)
Diesel Detailing Projects, by Kent Johnson, 1995, Kalmbach Publishing. (Great book on how to detail the locomotives)
Modeling
the Chesepeake & Ohio, by Garry J. Burdette, 1993, C&OHS.
(OK book. Mostly pre-Chessie stuff. Available through Chesepeake&Ohio
Historical Society)