A first message only needs to open the door to a conversation. It doesn't need to explain the whole club.
To someone who might be a customer
“I thought of you because you [what they care about]. I work with ClubAffili, which has a partner programme for [product]. Would you like me to show you next time you're looking for [product]?”
To someone who might become an affiliate
“I thought of you because you're great at connecting with people. I'm part of a free affiliate organisation that can grow with several partner programmes. Would you be open to having a look at how it works?”
Make it yours
Write in your own words. The templates are a starting point, not a script.
Say why you're contacting this particular person.
Only mention products that are available today. Check Overview → Partners if you're unsure.
Leave room for an honest answer, including “no thanks”.
Don't promise earnings or results.