What exactly are your career goals? Are you just looking to make the most money possible no matter what you do?
I have been self employed for almost a decade and it is not easy (but I love it!). You must be very aggressive, extremely proactive, disciplined and very passionate about what you are doing. Also, the first few years of owning a business are very lean and it's highly advisable to have at least one year of living expenses saved up.
If your end goal is simply to make as much money as possible doing whatever (and there is nothing wrong with that, I am just trying to understand) to me, starting a business is not the way to do that.
