What kind of commission do they offer? One-time commissions or recurring commissions? For example, many programs pay you one time for sending a customer. On the other hand, some programs like membership sites or SaaS (software as a service) programs will pay you a commission as long as the person you referred is a paying customer. Recurring commissions are great when you can find them!
Don’t put all your eggs in one basket. If you only promote one merchant’s products, you are stuck with their commissions, their landing pages, and ultimately, their conversion rates. It is important to work with many different merchants in your niche and promote a wide range of products. This affiliate marketing strategy will diversify the amount of commissions you make and create a steadier revenue stream for your website.
WP Rich Snippets – premium plugin that adds rich snippets (eg. review stars) to your snippets. You get 33% of sales and it’s what I use on my site. However the developer does not provide plugin updates or support. Here’s a post I used it on. If you’re writing reviews, you 100% need SOME rich snippets plugin. The All In One Schema plugin works too and is free, but has minimal settings. If you want to allow users to submit reviews, try the Site Reviews plugin.
Always disclose your affiliate relationship. Most visitors will probably understand that graphic ads will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.