This domain can work for people in two ways. One is to get sudden bursts of income by selling a certain product. The second part is selling a service that gives you recurring fees. This course on Affiliate Marketing Strategy for Stable and Recurring Income can be very helpful if your objective is the latter. At 5.5 hours and 56 lectures, this is very extensive and useful for those looking at mastering this subject. Details are available here.
Hands down I’d say the best thing you can do is research 1 primary keyword, craft an enticing article title that includes your keyword (though it doesn’t have to be an exact match), spend time writing your search engine snippets (SEO titles/meta descriptions), and by far the most important is making your content as VALUABLE as possible through videos, nice graphics, table of contents, bold/colors/styling, etc. Small things like keyword density barely matter.
When promoting a product, you are also promoting the person or organization that owns the product. This should be the first thing to know before selecting the product you are promoting. You surely don’t want your clients to be unhappy after purchasing the product. Trust me; they will never come back to your site again to purchase anything! This is because you have dented your credibility. Normally, any company or website with good customer service is bound to have happy customers.
If you would like to take a more subtle approach, include a product or service from your company that relates into your blog post. For example, let’s say that you are a wine connoisseur and that is what your blog is based around. In any post that is enticing your readers to open up a good bottle of Merlot or what have you, it would be wise to embed an ad for a quality, easy-to-use wine opener, wine glasses or stoppers that keep the wine fresh.
If the answer to each of these questions is a resounding yes, rather than jumping to conclusions immediately, take time to research whether or not others are out there making a sustainable affiliate income from products and content in this niche. In a sense, competition is a good thing here—it'll help you validate your idea and prove that it's worth of building a business around.