2nd tier.  If you are an affiliate for a particular program and you refer others to sign up for that affiliate program, a 2nd tier program will pay you when the affiliates you referred make sales. For example, I am an affiliate for Ultimate Bundles. If you join their affiliate program via my 2nd tier affiliate link here. I will get a small percentage of any sales you make going forward.
For a slightly different take on the subject and figuring out how to get targeted traffic onto your promoted links, you must have a look at Affiliate Marketing: Instant Traffic to Affiliate Links. A quick look at the reviews will help you decide if this is the exact course you are looking for. Sometimes the right approach is what is required to make a campaign work, this one might just work for you. You can see more details here.
What are the terms of the program? Is there anything I need to be aware of that would make a program not worth it for me. For example, Amazon Associates does not allow you to put your affiliate links in emails. If your main method of communication with your audience is via email, Amazon might not be a good fit for you. Wayfair, for example, does not allow their affiliates to post affiliate links on Pinterest or any other social media site. If that’s a strategy you rely on, Wayfair might not be a good fit for you.
Every course Pat creates is an amazing experience. The content is only one portion of that experience. His continued support, encouragement, and countless hours of his time spent answering questions and guiding you during the weekly office hour sessions are absolutely incredible. If you are serious about about applying this information to your business, you'll appreciate the support, tips, and strategies provided for you.
The terms of an affiliate marketing program are set by the company wanting to advertise. Early on, companies were largely paying cost per click (traffic) or cost per mile (impressions) on banner advertisements. As the technology evolved, the focus turned to commissions on actual sales or qualified leads. The early affiliate marketing programs were vulnerable to fraud because clicks could be generated by software, as could impressions.
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What are the terms of the program? Is there anything I need to be aware of that would make a program not worth it for me. For example, Amazon Associates does not allow you to put your affiliate links in emails. If your main method of communication with your audience is via email, Amazon might not be a good fit for you. Wayfair, for example, does not allow their affiliates to post affiliate links on Pinterest or any other social media site. If that’s a strategy you rely on, Wayfair might not be a good fit for you.
Affiliate marketing currently lacks industry standards for training and certification. There are some training courses and seminars that result in certifications; however, the acceptance of such certifications is mostly due to the reputation of the individual or company issuing the certification. Affiliate marketing is not commonly taught in universities, and only a few college instructors work with Internet marketers to introduce the subject to students majoring in marketing.[37]

"I have to tell you, I took the course and have implemented her strategies and am already seeing results. There are some courses I have taken and have wondered what I learned after I took it. That is not the case with this course. This is one of those courses you won’t regret taking. Michelle knows what she is talking about when it comes to affiliate marketing and she has results to prove it. She brings in over $50,000 a month in affiliate income alone. And now she is teaching us how we can do the same thing." - Crystal, Blogger, HappilyEverUncluttered.com
Cost per action/sale methods require that referred visitors do more than visit the advertiser's website before the affiliate receives a commission. The advertiser must convert that visitor first. It is in the best interest of the affiliate to send the most closely targeted traffic to the advertiser as possible to increase the chance of a conversion. The risk and loss are shared between the affiliate and the advertiser.
Affiliates discussed the issues in Internet forums and began to organize their efforts. They believed that the best way to address the problem was to discourage merchants from advertising via adware. Merchants that were either indifferent to or supportive of adware were exposed by affiliates, thus damaging those merchants' reputations and tarnishing their affiliate marketing efforts. Many affiliates either terminated the use of such merchants or switched to a competitor's affiliate program. Eventually, affiliate networks were also forced by merchants and affiliates to take a stand and ban certain adware publishers from their network. The result was Code of Conduct by Commission Junction/beFree and Performics,[31] LinkShare's Anti-Predatory Advertising Addendum,[32] and ShareASale's complete ban of software applications as a medium for affiliates to promote advertiser offers.[33] Regardless of the progress made, adware continues to be an issue, as demonstrated by the class action lawsuit against ValueClick and its daughter company Commission Junction filed on April 20, 2007.[34]

Great tips! Since I just started blogging in January I am still really just getting my toes wet in affiliates. However, I did notice that pictures and real life demonstrations of the product really help. For instance, I have several food posts where I talk about my favorite cook books and show what I have cooked out of them, and then included amazon links, sure enough I sold a few cook books.