Dear I am Tariq Mehmood of pakistani Nationality but now working in saudi Arabia

You can get contact with the Hong Kong Immigration Department and send the required documents by post or ask your friend to submit the application for you. The required documents are the application form (ID 1003A), your recent photo affixed on the application form, photocopy of your passport, photocopy of your financial standing proof (bank statements, saving accounts passbooks, tax receipts, etc.) and employment proof (e.g. salary slip), photocopy of your transportation arrangement proof, and photocopy of your itinerary. The form can be downloaded from the website of the HK Immigration Department.

Sir I want to ask you one question sir how many bank statement acceptable for visit type entry permit and whether it is free or there are some fees?

It is not stipulated that you should have how much money in your bank statement. Of course, the more, the better.