My wife and I used a book called Taking Charge of Your Fertility by Toni Weschler. It doesn’t teach the Creighton Method per se, but combines many of the common methods - Basal Body Temperature, Cervical Mucus and Cervical Position. All the methods are explained in-depth and she discusses how to use them in different combinations. She talks about the rules to follow if you’re trying to get pregnant as well as avoid pregnancy.
This book really suprised me - the author is not Catholic, and everything written is from a secular perspective, and yet she is an outstanding advocate of NFP. She stresses that NFP is not a form of birth control, although it can be used for that. This book addresses major and minor infertility concerns and shows how you can overcome them.
Like I said, this book covers several NFP methods, not Creighton specifically, but my wife and I read it, understoond it, and were able to put it into practice almost immediately. Also, the version with the CD includes some charts that you can print out, so you don’t have to make your own.
God Bless and good luck!