if you apply for visa to visit/transit HK for the first time, you should apply directly to the Immigration Department of the Hong Kong Special Administrative Region (HKSAR). Send all the followed requirements to them.
Application Documents: HK Visit/Transit Visa Application Form (ID1003A and ID1003B), one recent passport-photo size color photograph of the applicant, one photocopy of the passport page containing the personal particulars, proof of the your financial standing (e.g. bank statements, salary certificate issued by the company), air tickets booking, travel itinerary, etc.