So, you should prepare towels, hangers, another basin, toiletries and so on. Shampoo, shower gel ... In fact, these can also be bought in schools and small supermarkets over there, no problem. So, basically you don't have to bring anything from home.
In terms of living expenses, 250 yuan has enough food, 30 yuan's mobile phone, 20 yuan's water and electricity, and 500 yuan's additional expenses. Save some money and spend it on 400 yuan. Just everyday life. You need more in the first month, it doesn't matter, 800 can be spent. You can also work to earn some money in the future.