This post contains a quick, step-by-step walk over the procedure of creating a Physical Standby Database using Rman Duplicate command, not using any backup.
Setting up a physical standby database is a simple operation when the required infrastructure is ready.
We need 2 servers, a network that communicate both of them, and storage connected to the servers that is proportional to the database size + extra space for archive logs and backups.
The Oracle Home is installed on both servers at the same patch level; you may use also cloning to install the RDBMS home on the standby server.
You can find the details of the test on this document: