I have read many books about how to be rich since I was a teenager (Rich Dad, Poor Dad; Retire Young, Retire Rich; The Richest Man In Babylon; The Instant Millionaire; 365 Ways To Become A Millionaire; Cashflow Quadrant; Think Like A Billionaire; The Perfect Business; et cetera). They are nice books and I enjoy reading them; but I'm yet to come across a simpler way of prospering than that which the Scripture prescribes. Listen, if all you read is the Bible, it's okay!
All you need to do to prosper is to obey God. If you do what God says to do, you will prosper. Guaranteed! Read the Scriptures below:
"And keep the charge of the LORD thy God, to walk in his ways, to keep his statutes, and his commandments, and his judgments, and his testimonies, as it is written in the law of Moses, that thou mayest prosper in all that thou doest, and whithersoever thou turnest thyself:" 1 Kings 2:3
"Keep therefore the words of this covenant, and do them, that ye may prosper in all that ye do." Deuteronomy 29:9
"Only the Lord give thee wisdom and understanding, and give thee charge concerning Israel, that thou mayest keep the law of the Lord thy God. Then shalt thou prosper, if thou takest heed to fulfil the statutes and judgments which the Lord charged Moses with concerning Israel:" 1 Chronicles 22:12-13, and
"Only be thou strong and very courageous, that thou mayest observe to do according to all the law, which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest prosper whithersoever thou goest." Joshua 1:7
You want to prosper? Obey God. Period.