Hi Rajesh,

Please go through the Training provided by the tableau software..

You can get all the tutorial and course content from there itself

http://www.tableausoftware.com/learn/training

Go through the all the  on-demand videos,Register for live webinars..

Go through the whitepapers and knowledge base for the tutorial...

Install the Tableau desktop and start practicing...Happy Analyzing..

let me know in case of any help required...

Thanks

Sreenivas