Questions about Experts affiliate program

I’m with a web design agency. We build webflow sites for clients. We usually set each client up with their own separate CMS site plan. There is no intermingling with our own workspace. Since we refer so many clients to webflow we’d like to earn commissions. It seems that the Experts commission program is the way to go as it offers 20% self-serve subscription: https://experts.webflow.com/apply

QUESTIONS

  1. What is meant by “self serve subscription”?

  2. Will there be an affiliate link that drops a cookie, then we sign the client up through that link to get credit?

  3. Do the client accounts need to be in our agency’s dashboard/account or can they be independent of us?

  4. How long is the duration of the Experts exam we would have to pass to get certified and eligible for the partner commissions program?

Please confirm. Thank you!