Let me address your point nr. 4) immediately: no, you should not want to have anything to do with sites like Fiverr (here’s what’s really going on on Fiverr, you don’t want to be associated with deception and theft). You and Fiverr should not be mentioned in the same sentence, ever. You just said that you have 10 years experience working in the industry. Imagine if you were an anesthesiologist, or a lawyer, with 10 years experience, starting a new business: would you go look for $5 gigs? You would not. Cheap gigs will only help you build a harmful attitude toward pricing, clients, and how a web design business should be organized and your work billed.
There was a similar question on Quora the other day, a guy starting a new agency was asking what he should do first, you can read my reply to him if you want (I told him to first find clients who pay monthly):
And if you’re looking for clients, there have been discussions about that here on Sitepoint too: How are you growing your freelance work? - I replied to it, and even turned my answer to a fully blown blog post.