if i would like to go Hong Kong what will the procedure for me and what will be required docoments?

You can apply for Hong Kong visa through China embassy in Islamabad or China consulate in Karachi according to consular districts. You can also apply for your Hong Kong visas by contacting Hongkong Immigration Department directly, or through your sponsors in Hong Kong.

The requirements are
Your passport and its copy
completed Hk visa application form Id 1003A
one passport photo
Photocopy of proof of your financial standing, e.g. bank statements
flight tickets
hotel booking