Do NOT work for less than 7000 rmb per month. Any less and you are being ripped off. Thats for 20 hours. Look at the offers of jobs here. Don't be blinded by how wonderfull the city is culture does NOT put food on the table or help you to travel. Money does!
Don't expect good living conditions they don't exist here.
I really hope you enjoy yourself if you come here, but I think it will be an experience rather than fun.