After you have completed the AD RMS role installation as shown in the Install and Configure AD RMS Cluster - Part 2. I'm going to start the AD RMS cluster configuration. The first AD RMS cluster known as AD RMS root cluster. During the setup, you will need to access MS SQL server. Thus, make sure you have completed the MS SQL installation.
Create AD RMS Root Cluster
1. Logon to RMS01 by using RMSAdmin domain accoount, click perform additional configuration
2. Next

3. Select Create a new AD RMS root cluster
4. Enter the database server name and instance name. This database is hosted in MS SQL server
5. Enter rmssvc domain account with password as service account of AD RMS server
6. Select Cryptographic Mode 2 for better security.
NOTE: Not all client machines is supported Cryptographic Mode 2
7. Use AD RMS centrally managed key storage
8. Enter the password. This password is important and do not lose it
9. Leave Default and Next
10. Enter the cluster address. This address must match the name in the certificate. I'm using spit DNS, thus internal and external URL will be the same.
11. Select the imported certificate which is the same certificate used in UAG01, UAG02, EXCH01, EXCH02 and RMS02
12. Name the server licensor certificate
13. Register the SCP now

14. Click Install
15. Close
16. Status of AD RMS in health