I think the difference is an entrepreneur has orchestrated the whole process and isn't just a sales person. They are a dreamer building their dreams in to reality. Anything that reflects the achievement is massive. If you love carpentry, then seeing somebody love your table will be the same. Selling tables at Ikea will probably not be.
I don't have a portfolio site, but was successfully freelancing on the basis of referral for four years or so. I wouldn't take a random client on, because bad clients cost money. Reach out to anybody who trusts you to "get the job done" and get them to reach out. Networking and trust are essential.
Another idea getting your foot in the door as a freelancer at an agency. About 1/4 of my work (and best paid work) came that way. Gives you a client base to build from (though not your clients, it will give you demonstrable experience)
As a C programmer, this is flattering, but I also know it isn't true. I wrestled with Erlang for a good while before I got the hang of it. Going from C up the tree of C-like programming languages has its disadvantages.
Knowing both C and Javascript, and loving them both ... I would go with Python+Flask as the sensible choice. However, Go is a cracking language but not all that mature. Javascript is great if you use a decent framework too.
As a C programmer though, I read http://startupitis.blogspot.co.uk/2012/05/golang-its-amazing... and had to write some Go and didn't regret it. Not sure about its fit for web development, but good fun anyway. You may find yourself writing boilerplate with Go though.
Just play with them and see which you enjoy most. Enjoyment pays you back in productivity/motivation.
