@Groupthink
You explore your own interests, read a lot, attend network stuff, subscribe to trade stuff, etc. Keep in mind that this is a business and you need to understand how money is made in these areas and what the market is worth. Two basic types of ways to make money: making a product or providing a service. In general, it is much harder to break into very established industries. For example, it is unlikely that you are going to revolutionize steel production. Eventually, you learn enough to have an idea. Or you have associated with the professional network long enough that someone who has an idea invites you in.
Do not try to use theory based services. The world has largely progressed beyond this skill set. For example, malls provide free wifi so that they can geographically track shoppers, see how long the shoppers stop by a display, store, etc. This is one of the ways marketing is done now. If you showed up and pitched some theoretical ideas about cognitive dissonance, you'd never be hired.
