Hi Ashutosh,
The link below gives you a comprehensive guide on component development for Design Studio:
http://help.sap.com/businessobject/product_guides/AAD13/en/ds13_dev_guide_en.pdf
You may need a working knowledge of Javascript to get started with this. However, I think you should be able to find all the help you need in that developer guide. I hope this helps.
Thanks and Regards,
Eshwar Prasanna