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.
The topic you choose must have enough depth that you can create a lot of content for it. This is important for building an authoritative site, for search engine optimization, and most importantly, for the end user. If you don't have enough content about a topic, you're not going to be taken very seriously as an authority on the topic and it's unlikely you can convince someone to make a purchase from you.
Promote products that are stepping stones to products you will create in the future. This is a bit more advanced, but is a great way to think ahead. Amy Porterfield suggests thinking about the first thing your followers will need in order to get started with what you provide. For example, I teach people how to blog, so the first thing they need to start a blog is hosting. That’s why I am an affiliate for hosting.
Do Paul! Affiliate marketing is awesome – and you’re right, it can be overwhelming b/c it can be hard to know who to trust, but it’s a wonderful way to make money online — esp when you’re promoting products/services you are proud of. Let me know if you have any questions. There’s a lot I don’t know … and a lot I do. For what I don’t know, I can find the answer for you.
Use the Google Keyword Research Tool to break down your chosen niche into more specific niches. Weight loss is a popular topic, but it is too broad. People want to lose weight for many reasons: vacations, weddings, summer, the new year, birthdays, and other special events. Choose a specific niche, such as "weight loss for summer" or "weight loss for weddings."
Amazon's commission rate is pennies from each dollar of merchandise that you sell. What many people don't know is that there are affiliate opportunities out there that pay commission rates that are much more favorable, from $20-$100 (and even more). Browse affiliate networks like Commission Junction, Share-a-Sale, Rakuten and Ejunkie for opportunities and their general commission rate.