Hi Debal,
The first problem I encountered with that site is that it's very slow. The images in the slideshow are around 150KB each.
I really think you need to focus on a lot of on-page optimization before off-page is even considered.
As Brad suggested, them guides are a great first step to finding the best practice. You really can't use 10 keywords in a URL and also, you can't target 10 keywords per page. You should be focusing on a keyword or at most two keywords per page. If you go beyond this, you might have keyword cannibalization problems.
Please read the guides Brad linked to. It will answer the questions you have.
After reading them, we would be more than happy to help you.
Cheers,
Mark