Well, this is a wide open subject. The statement "I want to start a business" leads to the obvious question, what kind of business? Believe it or not, I've had conversations with people who have no idea what kind of business they want to be in, they just know that they want to be their own boss and control their own destiny. Though I admire the entrepreneurial spirit that drive this dream, I know what the real story of business ownership is.
You certainly need to know what kind of business you want to own/operate, there is a foundation to lay and things you can do that will be a strong base for any business. Let's jump in and look at Business Basics 101.