Good news, Catsup ~ start with the Roman numerals, don't miss "The Doctors Opinion". Some folks go right to Chapter 1 and miss that. Then, up through page 164 is the heart of it...just read and digest, and ask questions if you don't understand. Matter of fact, Dallas has a great Big Book study section on this site - as you read, feel free to post your thoughts and questions on each section. Someone can pop in and see if we can help you out with any questions.
The second half of the book is a collection of stories by AA members. They are worth the read as well, however are not considered the "Program" of AA.
You may know all this - don't recall your AA experience in the past. Just ignore me if you're way ahead of me!