Problem

Hi, Fawad ul hassan.

Here is the best resource for how to use the iTunes Store on the iPad.

Using the iTunes Store for iPhone, iPad, and iPod touch

http://support.apple.com/kb/HT1491

If experiencing issues connecting to the iTunes Store, here is an article that will help you troubleshoot this issue.

Can't connect to the iTunes Store

http://support.apple.com/kb/TS1368

If experiencing issues with Internet connectivity, this article will walk you through some troubleshooting steps.

iOS: Troubleshooting Wi-Fi networks and connections

http://support.apple.com/kb/TS1398

Cheers,

Jason H.