Best practices for protecting content behind paywall

Site URL: https://www.spaceadvisors.com/

I am looking for smart options to publish a white paper on squarespace site that will be periodically updated. I'd like to be able to provide both complementary and paid access. Additionally, I'd like to be able to offer some paid video content on the site that is protected by a paywall or similar. Thank you in advance for ides, suggestions and recommendations.  🙇