So I think for starters it might be a good idea to pick the profession where the skills you acquire enable you to create stuff...
There's enough random chance and other variables involved (e.g. your marketing & business skills) that this variable just isn't worth blowing too much time on. You'll probably have to make a lot of attempts & drastic course corrections to make it stick.
Make life an amazing journey for yourself and give yourself permission to jump into something with both feet and experience it fully, without the worry of "did I pick the right one".
My current plan is: 1 Find an industry with a ROOT problem that hasn't been solved. 2 Solve the problem. 3 Implement the solution in software form. 4 Sell the Solution, packaged in sw. 5 Profit.
I'm still trying to find step 1
And TOC provides the tools to identify cause and effect relationships that in the end lead to to the root problem.
http://en.wikipedia.org/wiki/Thinking_Processes_(Theory_of_C...