If you get THAT clear and believe in some product, go ahead. Your audience trusts your word. But most folks need to use or experience before they can get clear, because they have a fear: the fear of using trust. I am slowly losing that fear but still use what I promote, before I promote it. I also just sell my stuff mainly. Since I have quite a few products and eBooks and services to sell.
Long-tail keywords are search phrases, rather than one or two words. If you are planning to promote an online poker course for example, you might do some keyword research and decide that the term "online poker course" has too much competition from existing websites, but articles based on things like "When to push during a sit-n-go" don't have as much competition and may yield more traffic.
If you are a confident web developer then designing your own themes is an obvious path to follow if you are looking to make money online. ThemeForest sells a wide assortment of developers themes, including themes for WordPress, Shopify, Weebly, and Tumblr, to name a few. Once you have created your theme, get it accepted onto the ThemeForest marketplace and make money each time it sells.
Tremendeous free teaching, that helps clear the smoke on what it takes to get an online business going. BUT, you concentrated on click bank and said nothing about getting my web site going and all the necessary details. I always thought the web site as a business sign telling people that xyz is open for business, check it out! Otherwise, people would walk and not even knowing that your biz is open. True?