i need HK Visa. how do i go about it? time for the application?

If you go there for tourism purpose, you should first prepare copy of passport, the application form, a passport-style photo, proof of your financial support, transportation and accommodation arrangement, and your travel plan, as well as residence permit in mainland China. Next, post the application to HK immigration department. Below is the postal address:
Receipt and Despatch Sub-unit
HK Immigration Department
2/F, Immigration Tower
7 Gloucester Road
Wan Chai, HK