Hello Praveen,
Thank you for posting your questions. Do you currently have an Agile account and are in the process of testing and experimenting with it? As far as getting started the following link is a getting started guide that would beneficial to review.
Get Started | CA Agile Central Help
If your interested in using Agile we could refer you to our Sales team you can provide you with more information.
As far as use cases that we see do you specific examples that you are looking for?
I would be glad to provide you further feedback if you have additional questions.
Thank you,
Christian Maldoff
CA Agile Central Customer Support