On average how much does it take to live in Shanghai per month? What is a good area to stay in that is not too expensive. How much should I expect to spend on food monthly? In order to live well, what should I be earning there?
You can easily make it on CNY2000/month. That will cover rent, food, the occasional bus ride, pre-paid cellphone card, etc.
You can also live the lifestyle where you spend CNY4000/month on food alone.
You need to clarify your definition of living well. Will you want a car? Electric bike? High-speed internet access? Do you mind having your bathroom 3 steps away from your kitchen? Have a problem with living on the 5th floor of a building with no elevator? Comfortable shopping for food at the wet market, or are you always going to buy your knosh from an expat supermarket? Want a flat with an actual oven? Willing to take a bus or do you prefer the privacy and comfort of a taxi?