Hello there,
You have to engage them with interesting games that they can all play together because if you do not have their respect unfortunately they will never behave nicely and wait their turn in a game.
Ideas are musical flashcards where all kids move around and jump on the flashcard you name when the music stops. The Big Freeze where kids move slowly while you say different sentences in English and when they hear the word "orange" (or whatever pre-defined word) they FREEZE, and if they make any noise while freezing they are disqualified and have to sit down.
Since you don't speak Chinese you will have to demonstrate the game by singing a tune while you walk around then call out a word and jump on the flashcard. The first time you play, play ONLY with words they know really well since you want to teach the concept of the game. Once they have the game concept down you can throw in new vocabulary words, only three at a time or they probably won't cope.
Try this story for size - if you have their attention with nice materials that helps:
Lesson Plan:
https://teachingenglishgames.com/eal...hool-learners/
Story:
https://teachingenglishgames.com/english-story/
Song:
https://teachingenglishgames.com/fruits-song/