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It is a communal eating style in China. Except your own bowl of rice, and your soup bowl, all dishes are shared.
Use Chopstick. And it is OK to use spoon to get food from plates.
Never poke or "examine" the dish with your chopsticks.
Decide what to pick up before reaching.
Never put Chopsticks straight up in a bowl, because it looks like incense sticks placing in urns at the temple to worship the ancestor.
"A formal Chinese dinning is always accompanied by tea, beer or distilled spirit. The one who sit closest to the teapot or wine bottle should pour them for others from the senior and superior to the junior and inferior. And when other people fill your cup or glass, you should express your thanks. Guests can not pour tea or wine themselves".
Chinese host loves to put food on your plate, as a way to show hospitality. It would be better to accept it and It is OK if you cant finish it. Just say I am full.
Put bones and seeds , if any, in a different plate (restaurant usually offers extra plate)

Resource and more rules: http://goo.gl/FXepU