Find one (even micro) influencer who loves your product and make a deal. Use that one to learn and as a referral to the next one.
First one is the hardest.
Hi Sean. In my experience, the best way to grow affiliate marketing campaigns is through blogs that have a good SEO. For them is less risk to start working with your product since all the work they have to do is update their website naming your page. Once they make that, they will receive recurrent revenue from your product.
Hope I could provide some value for you. Would love to connect and share some more detailed ideas