How can I get my tourist visa for China?

Hello

I will be going to China in August for 10 days to visit a friend of mine who is working there for the summer. She is staying in Shanghai with friends (a Chinese family) and that is where I will be staying for the weekend when I arrive in Shanghai so will not have a hotel reservation. We will then do some travelling around China. What do I need to provide with my application?

Also, on the application form (Form V.2011A), what is the difference between sections 2.8 and 2.9? (2.8: Name and address of inviter or contact unit in China and 2.9: Name and address of your relative, friend or contact person in China). Do I only need to fill one of them in?

Thanks
Duncan