Difficulty: Moderately Easy
Step1
Proactively look for the most credible, trusted, successful leaders in your marketspace. These sites tend to be the highest rated on Google and Alexa, look professional, have been around for some time and often have active discussion forums, blogs with frequent updates of new content.
Step2
Don't expect to reel in the biggest names right at the beginning - try them, but be satisfied with the middle tier since the smaller players sometimes provide the best results.
Step3
Be professional, on target, and do your homework before contacting potential partners - study their website, their business model, their marketing methods, their message to market match so you can come to them with obvious and sincere interest in their business. You want to help them offer something terrific to their subscribers, customers and visitors.