Minimal deployments include one vRealize Automation appliance and one Windows server that hosts the IaaS components. In a minimal deployment, the vRealize Automation SQL Server database can be on the same IaaS Windows server with the IaaS components, or on a separate Windows server.
You cannot convert a minimal deployment to an enterprise deployment. To scale a deployment up, start with a small enterprise deployment, and add components to that. Starting with a minimal deployment is not supported.
The vRealize Automation documentation includes a complete, sample minimal deployment scenario that walks you through installation and how to start using the product for proof of concept. See Installing and Configuring vRealize Automation for the Rainpole Scenario.