Welcome to commvault
Generally a good starting point so you can get yourself familiarize with the Commvault suite would be the Commvault Documentation Site (http://documentation.commvault.com/commvault/).
It provides pretty all type of configuration within Commvault. Once you get a better feel with the software and understand the major Backup Types utilized in your environment, you can then target more specific areas within the Documentation to get a better understanding.
Likewise reaching out on the Forum is also helpful to focus on specific areas of interest.