Principles is a book I wish Ray had written earlier so I could use some of the ideas he shared about building one's life principles. I read Principles in 2017 and I am still not done with it. Principles will teach you how to define what you want in life, based on your own reality, and how to design principles to help you achieve those goals.
Forget lengthy business plans. Business Model Generation will teach you about the most critical elements of a business model and how to create a new business plan within hours. I came across the book while in college, met Alexander Osterwalder, and I have been a fan since then. I have used the business model and the value proposition canvases to test and iterate ideas and business models for multiple businesses. Check the framework section for all the canvases from Strategyzer.
7 Habits of Highly Effective People was my first step to living a principle-centered life. Rather than focus on looking good and impressing others, 7 Habits offers an inside-out approach to life.