One of my favorite Blogs is Seth Godin's. Whether you are a marketer or not it has some great insights into life and business.
He did an informal MBA program with some students this spring. They just finished and one of the big lessons that they learned was to go make something happen!!!
What I have learned is that whether you have an MBA, an under graduate degree, or no formal training at all if you GO MAKE SOMETHING HAPPEN you will learn a lot, most likely be doing something you like to do, and will be passionate about what you are doing.