To create a duplicate database, put the following steps in the correct order: 1. Start the auxiliary instance as NOMOUNT. 2. Allocate auxiliary channels if necessary. 3. Run the RMAN DUPLICATE command. 4. Create a password file for the auxiliary instance. 5. Ensure network connectivity to the auxiliary instance. 6. Open the auxiliary instance. 7. Start the source database in MOUNT or OPEN mode. 8. Create an initialization parameter file for the auxiliary instance. 9. Create backups or copy existing backups and archived log files to a common location accessible by the auxiliary instance.