email collect saas idea

I was thinking to create a SaaS for creating a landing page to collect emails. Flow is something like this. 1. Create Landing Page using provided template or builder 2. publish on subdomain or custom domain 3. See & download collected emails as Excel. Target customer would be someone who wants to go live quickly to collect emails. I want to keep it simple. Onboarding should be simple. It should not take more than 15 minutes to go live for new customers. (dns resolution can take time) any tips ?