Hello, I am a student who is studying in the UK. How should I apply for visa to visit my sister?

I am originally Myanmar citizen and I would like to ask how should I apply tourist visa to china from the UK. On the other hand, I am not going to stay at the hotel cuz I am going to stay with my sister who is studying in Shanghai and living in her own flat. What documents do I need to prepare for it. Do I need to prepare for invitation letter that wrote in Chinese from my sister if I apply for visa. And what should I do if I would like to stay there more than 30 days. And how much does it costs for visa fees. Thank you so much.