visa to china and hong kong

Yasir, as far as I know, if Pakistanis apply for tourist L type in Pakistan, his/her application will be denied because PRC doesn’t accept individual tourist from Pakistan. But I’m not sure whether you can apply for it in Dubai or not. You’d better contact with the embassy of PRC in Dubai and confirm that. If not, I think you should join a tourist group and apply for the group tourist L type.
As for HK visit visa, you need to provide those documents containing the completed application form affixed with a recently-taken bareheaded color photo, your passport and copy of its data page, your flight itinerary, and proof of the financial support as well as your travel plan to HK.