Try a search here, there are only about 487 threads already on how to get an account...it's that light-colored rectangular looking box up at the upper right part of the page...can't miss it (well, since so many do I shouldn't say that!)
Why don't You start writing your blog and after around 15 original content then You can apply for adsense?
Adsense accounts can be had for free if you have a web site that qualifies. If you purchase an account, you risk having it disabled permanently if you don't have an Adsense-compliant web site. People form Pakistan are getting Adsense accounts all the time. You just need to focus on building a web site that will get you approved.
you should have to contact Google Adsense support team for that. I thinks in the country like Pakistan, Bangladesh, India, Sri Lanka etc Google dose not approved their newly requested adsense account to be opened.