Hi Prateek,
First I would recommend reading the Rules of Engagement (Getting Started link at the top right), then going to the Overview page of the SAP Transportation Management community. There is a wealth of documents and guides there available for the reading.
When you have digested enough to understand the basics of TM, come back and post specific questions in a new Discussion. This thread has been locked.
Regards, Mike (Moderator)
SAP Customer Experience Group - CEG