How to make a decision based on Buddhist principles?

I have been practicing Buddhism since a child, about twenty years. Throughout my adult life I have been trying to combine my practical life with my Buddhist beliefs. In some situations, however, I am not seeing how Buddhist principles apply to decision making. For example, how do I apply Buddhist ideals in deciding which college to go to, what profession to do, and what job opportunity to pursue? These are the mundane but unavoidable decisions for the layman. Of course, I'd not pursue a career in military or defense industry due to my beliefs, but there's not always a clear choice between other professions, jobs, etc based on Buddhist beliefs.