Dan Eden is a prodigious young brit working for Dropbox who has already contributed a large amount to the web design world. He's got a blog that's admittedly not updated often - but what's there is worth your time.
One of the most integral pieces of a freelance business is your billing. I've been using Hiveage since it was called Curdbee, and love it. It's not as ubiquitous as it should be, but you should definitely check it out.
While there are a slew of full-featured, easy-to-use CMS options out there, my personal preference is a lesser known one called MODX. If you take the time to get into it, you can do almost anything you want with relative ease.
If you're just beginning in web design, I've shared a few resources already that should help you build up your fundamentals—but no resource is more effective than Treehouse. They do a fantastic job at making complex concepts easy to understand, and their wealth of material covers much more than just web design.