These steps include deploying Workspace ONE Access Connectors and configuring Active Directory synchronization. Configure SAML authentication in your Horizon environment, as described in Configure SAML Authentication in Horizon for Workspace ONE Access Integration.
Techzone is the best place for to spend any extra time you have to learn more about these solutions. Over the past 2 months I have been implementing additional functionality into our WS1 environment and 90% documentation for these efforts came strait out of techzone. I hope your WS1 + Horizon project succeeds and I'm looking forward expanding my WS1 footprint with Horizon in the near future.