High-ticket consulting or coaching: You could sell your own high-ticket consulting or coaching products from your website. You'll still need a website, merchant account, sales funnel, lead magnet and many other items. But you can easily earn a substantial amount of money from each individual customer, making it well worth the arduous setup required.
Sign up for a reputable affiliate network: Aside from Amazon, there are dozens of large reputable affiliate networks, such as Share-A-Sale, Clickbank, and Skimlinks, that specialize in connecting you with merchants who are looking for affiliates to sell their products. They charge relatively low commission fees for the privilege of connecting you with merchants, and the merchants on these sites tend to offer much higher commission percentages or set dollar amount payouts.
Glad to hear it! Absolutely, CPA credentials are still extremely valuable—though it definitely takes a time/education investment in order to secure those credentials. Worth it though? I’d say hell yes, if the field interests you. Even the side income you could make by doing taxes for people just a few months out of the year can be lucrative here in the U.S. at least.
I also attended a recent webinar (Sept 2017), and much of the content was newbie questions about how to manage time and how to get started. Those will be interesting for a real newbie who's just curious about online marketing, but for someone looking to take action, I saw very little “instruction”. The vast majority of the webinar was just looking at a static screen (CBU members area).
ClickBank represents primarily digital or downloadable products. These typically have high-percentage payouts to affiliates. The commissions average around 50%. You do need to be careful and closely vet all products. There are some great products, some good products, and many crap products. You need to be sure the product and the promotional methods are appropriate for your audience. But ..