Priniciple # 2: Organize by topic.
Many people attemt to learn the "Golden Chapters" or whole books of the Bible. While this is a noble attempt, it is not the way the Word of God will be used while teaching or preaching. Choose a topic you would like to study and then memorize every verse that deals with it. The next time you are speaking on that particular subject, your mind will be able to tie these verses together to truly allow you to "preach the Word..."