Sorry to point this out, but you sound more like a recruiter than a designer. I'm sure people would answer your questions if you would ask them a little bit less bluntly.
My answers to your questions are: 1. I showcase the projects I've been working on 2. I don't describe the projects, just point a link to them, they should describe themselves (README, code comments, etc.) 3. Someone very skilled to make them good money with little hassle