When promoting affiliate offers, just make sure you are fully aware of all the terms and conditions attached to your affiliate program. Some programs can be strict about how they allow you to promote their products. For example, some may limit you to banner ads and links only, while others will allow you to use paid advertising, but won't allow email marketing.  

people who visited the site but did not opt in > you can use negative audiences for your ads with facebook ads, you just take visitors to the site and substract the people that visited the thank you page. For people who did not purchase, you simply can't with affiliate marketing unless the vendor adds a conversion pixel of yours on their thank you page.
You don’t necessarily have to have a huge site or lots of traffic. Consider emailing an affiliate program’s contact person (look for contact info on the site or in affiliate newsletters) if you send a lot of leads their way, rank well in the search engines for a related keyword or have a high conversion rate. Make your email compelling. Read my tips here. You just have to be a good fit and provide excellent value to the merchant. Another good resource for this is here.
Clickbank, huh... now that's a name I haven't heard in a while! I remember messing around with them back in 2011 when I was a newbie. Never did make any money with them, haha, but I've seen plenty of people who have! I've just never been any good at pushing the weight loss stuff, which I'm pretty sure is where most people make their money with Clickbank.
Will my target audience realistically buy this now, or at a different time? Be sensitive to sales cycles and seasons. Maybe you should avoid holidays (when people are away from their computers, like July 4 in the U.S.) or maybe you should target holidays (like the day after Thanksgiving), but know the difference. Again, know your audience. Plan your content accordingly.
Creating blog content is a very useful and effective way of consistently building content on a site. When creating blog posts, it's a good idea to do some keyword research to figure out what it is that your audience is interested in and searching for online. Also, be sure to research competitors, forums and social media to narrow down on topics for your blog. 
An influencer is an individual who holds the power to impact the purchasing decisions of a large segment of the population. This person is in a great position to benefit from affiliate marketing. They already boast an impressive following, so it’s easy for them to direct consumers to the seller’s products through social media posts, blogs, and other interactions with their followers. The influencers then receive a share of the profits they helped to create.

Mobile advertising never looked this good! Make it easy for your affiliates to run Pytch mobile campaigns. Pytch is a mobile ad platform that provides advertisers the ability to make more money, with the support of the strong ClickBank backbone. Pytch works by pairing your health, fitness and lifestyle video or mobile banner ads with great mobile app developers. After you upload your creative media, …
While the world goes gaga over Digital Marketing, few seem to be discussing affiliate marketing in depth. A true gem, a lot of digital marketing in the future will be reliant on affiliate marketing. While social media marketing helps create buzz, search engine marketing helps drive traffic, affiliate marketers helps converts traffic into leads and sales. As the focus on ROI and analytics grows, more businesses will demand (they have started demanding already) people to showcase the exact value of digital marketing efforts. If there is one decisive way to measure digital marketing, it’s affiliate marketing. These are best suited for both affiliate marketing beginners and experienced professionals. Of the thousands of methods to make money online, Affiliate Marketing stands out. It has been more than a decade that thousands have turned millionaires simply by mastering this art and its your turn to grow and shine now.
Now as to your comment on traffic it is true, traffic is important. But the truth is, acquiring traffic is easier than converting it. Plus we have many posts dedicated to traffic generation on this blog. Simply check this post, this post or this post. But must importantly, the reason why people struggle with traffic is that they try to promote a sales page or a heavily biased piece of content. Nobody wants to share that, nobody wants to link to that, and as a result you don't get traffic and blame your lack of success on traffic (like you did in your comment above).
Take advantage of affiliate program freebies when available. Many affiliate programs provide free printables, guides, webinars or other lead magnets designed to get potential customers in their sales funnel. As an affiliate, you can share these freebies with your audience using your affiliate link so if they eventually make a purchase, you’ll earn a commission, but if they don’t they still get value upfront.
In 2006, the most active sectors for affiliate marketing were the adult gambling, retail industries and file-sharing services.[17]:149–150 The three sectors expected to experience the greatest growth are the mobile phone, finance, and travel sectors.[17] Soon after these sectors came the entertainment (particularly gaming) and Internet-related services (particularly broadband) sectors. Also several of the affiliate solution providers expect to see increased interest from business-to-business marketers and advertisers in using affiliate marketing as part of their mix.[17]:149–150
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