@Kirtish Many beginner ask this question often. I recommend you to check the tutorials of the section webMethods Free Trial tutorials from this link: webMethods Integration Server Tutorials
It is a good starting point for you. After that you can walk through the documentation. The three component (Integration Server Administrator’s Guide, Service Development Help, Working with Designer) are very nice to have a good understanding of the platform.
As @Holger_von_Thomsen suggest, learning.softwareag.com is good ressource that can help you in your journey.