Chinese tourist visa application in US.

I will be in Hong Kong to study at Lingnan for five months I understand that one needs a Chinese tourist visa to visit the main land. The issue that am having is that it asks for specifics on dates and where I will stay which am not sure of yet in sec 2.3-2.5. should I wait till I get to Hong Kong first to get it or what is the best way to answer those questions.I would like to have it on hand when I leave the U.S. thanks