The first thing to focus on is whether your audience would buy that product and/or service. Then, look at how their affiliate program works – when they pay you, how much they pay, whether they have a recurring program (for as long as that person stays a client or for the first few years) and so on.
Apart from encouraging your partners to promote your products and services, which is a part of your job, concentrate on measuring the effectiveness of your marketing efforts. This will help you to discover the most loyal affiliates and detect problem zones in your affiliate program. Focus on tracking the following parameters: Number of affiliates and the most effective onesSize of each order generated by affiliate marketersTotal revenue received with the help of affiliate programsNumber of sales for each affiliate partnerNumber of marketers that have abandoned your affiliate programNumber of new affiliates, etc.

Your neighbor could be making a killing promoting hunting rifles, but what do you, a 19-year-old college student, know about guns? Don't mimic what other people are doing just because it seems to be working for them.
These third-party services act as an intermediary between sellers and affiliates. Although they can help with finding and managing affiliate accounts, they don’t offer as much control or autonomy as self-hosted programs, such as what you can operate through Easy Affiliate.