Premium content can mean any type of content you charge for - an ebook, whitepaper, downloadable guide, etc. But what I'm referring to here is pay-gated content. Basically you just put some awesome content up behind a paywall, which means visitors pay to access it. You can get your own paywall set up in 10 minutes or less using a plugin like MemberPress or Paid Memberships Pro.
I know many personal finance writers with blogs that track the financial mess they got themselves into. They don't have financial degrees, but they are doing very well for themselves and help many people with their experiences. Many times, readers just want to hear from you, follow a real person's journey, read about how a real person made it through a problem, and so on. This is a great example of why degrees are not always needed.
Have in-depth knowledge in your niche? Package it up into an ebook and sell it on your blog. I'd generally advise against selling it (at least exclusively) on Amazon or Kobo, as you'll probably be able to charge much less. If you've already built up a solid audience, you can probably change anywhere from $5 for a very short one, all the way up to $39+. 

When anyone asks me about starting a professional money making blog I always recommend them to use self hosted WordPress as it’s the best platform for bloggers. I always recommend to new bloggers to use BlueHost to host their new blogs. You can get BlueHost’s high quality hosting for  $2.95 per month (36 months sign up) Use this link to get a free domain name with your hosting.
PS: my answer to this question is always… “the better question is… how can my blog help me build a profitable business?” Most of the profits from blogging are not made on your blog, but that’s okay. I don’t believe blogging about making money per se, but about branding yourself and positioning yourself within your niche market as an authority and leader. Once that is established, there are so many ways to move people into your money making enterprises. Email marketing, as you pointed out, is one of the best ways to do this. Sending people to your membership sites, services, info products and coaching programs are all great things to route people into as well.
The next thing you do is start sending traffic to your landing page. For example, you could go out and do guest posts and link back to this big article. You could run Facebook Ads that are targeted towards the right audience. You could link to other bloggers in the post and then email them and ask for a simple tweet. Here are some more traffic tips.
Direct Income – when I started making money from my blogs it was through ‘direct’ income streams. I put AdSense ads on my blog and promoted some products on Amazon as an affiliate and the more readers I had the more income began to trickle in (it really was a trickle at first). In time as my traffic grew this income grew and I was also able to experiment with other direct forms of income such as selling advertising directly to advertisers.
To all the bloggers out there…STOP sucking up to the very small, elite and narcissistic group of self-proclaimed influencers out there. If you all stop treating them like they’re special, they will not longer by special and therefore some of us who aren’t in there secret society will be seen as knowing what we’re talking about too! This isn’t High School, grow up and read someone else’s blog already! 
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