Visa documents. Hi, i am Pakistani student, studying in Fuzhou Fujian.

I am to visit hongkong. How can I apply for entry permit, I prepared all the documents. Can I send it to Beijing office via Express service? Or personal appearance is required ? Or can I send it to hongkong immigration office in Hong Kong?
And how much time will it take for visa if apply in Beijing office, or if hongkong immigration office ?