What documents do I need.

My husband is working in China right now and I will be joining him in January. He currently has a business visa and will be converting it to a work type when I arrive. I was wondering what I need to do before I go. What type do I apply for here? Do I need to get a physical before I go? I will be going to Hong Kong first fo abot a week, then to Shanghai for a week and the rest of my stay will be in Beijing for about six months. Please help.