A MBA isn't a bad idea, HOWEVER, if you are absolutely set on aviation, then treat your training just as if you were getting an MBA... (Study as if if aviation were your job, particularly if you plan on it being your occupation one day) Seek out people with more experience, more ratings, and especially more knowlege and make them your best friends. . (figuratively speaking)
I highly recommend going to a formal school for your additional ratings (just like you would for the MBA), which should include a CFI... unless your pockets are very deep... (Banner towing, pipeline, and carrying parachutists are VFR jobs, typically in single engine A/C). They may pay the bills for now, and build up total flight time, but do very little for instrument skills and overall knowlege. I once flew with a CFI candidate who had exclusively flown skydivers, and he couldn't do a steep turn to save his life. The desire to drop the nose as he started the turn was so ingrained that he never could overcome it. I imagine the same is true in terms of his knowlege of the FARs. (Not to be obnoxious, but what is going to make you stand out at an interview? There are ten other guys standing there with the same suit, and the same red tie. Any advantage, no matter how small, is significant in this regime.)
Once you do get a decent flying job, and you will if you are willing to sacrifice, probably for a number of years, then DON'T STOP STUDYING! Know the Regs, your airplane, and your Company's procedures. These are the things that will save you at your next interview, or more importantly, from a violation, or worse.
Finally, once you're at that point you should consider where you would like to end up ultimately (preferably half a dozen choices), and send out resumes/applications tirelessly. It's going to look much better if you were updating your application with a company even during the "bad times", than waiting for eveyone to jump on the bandwagon when that company posts a new-hire class two years from now. Regardless, good luck.