@SeaGreen
People will be along shortly to say that you can eat like Bobby Sands and sleep like a hobo and spend 10元 a month to get by.
If I were to offer some sensible opinion it would be:
Your 1,500 a month should be fine for a flat, no need to share. If you're looking online the term you will need to look for is 单身公寓 (Dan Shen Gong Yu) - A singles appartment. This will look like a hotel room except with a fitted kitchen and a small balcony. Some will even clean your clothes if you leave them outside the door, most are new and clean.
In reality, if you're coming to teach I think how it usually works is that your school will have a place for you already or on your first day here they'll whisk you around the local area showing you what you can get for your allowance. It's best just to first leave it with them.
On top of your rent you'll have to pay leccy, water and management costs - also maybe a few yuan for your TV arial cost. As Air con isnt needed in Kunming you'll keep costs down.
As for food. In some cases eating out is a lot cheaper and less hassle than eating in. If you're going to cook youll have to factor in a toaster overn (100-500元) from the market, and some utensils. I'd say that you could look on the for sale ads here but people have a tendency for selling their spoon, used for 10 years, for 3 yuan less than they bought it for - just buy new.
Other 'arrival' costs you may have to factor in will be a new mattress, chances are the one in the apartment will be crap, along with a few nights in a hotel while you find a place. For hotels you'll find somewhere - Hanting, HomeInn etc - for around 200-300 a night (Your school will probably stump up for this). A mattress could be 500 up.
Food is cheap. If you fancy living like a farmer you can spend 10元 a meal and be fine, although this is'nt recommended. They don't have Whimpys here like in GB, but if you fancy the crap American alternative KFC or Burger King, you'd be looking at 40-50 a meal. There is a great choice of foreign restaurants in Kunming and none are particularly expensive. Chinese restaurants tender to the crowd rather than the individual customer but finding a few dishes for up to 100 should be no problem in an average city centre establishment, less in many cases.
Getting around should be easy for you. My employer gave me a transport card when I arrived, perhaps yours will too. With this you'll be able to take the underground. For now this runs North to South but will head through Guandu. The carriages smell of vegetable fart and there are no windows to open but a journey will be cheap, although tedious, at around 5rmb. If you're in dire straights buses tend to cost either 1元 or 2元. You could, in theory, cross the city from east to west in a taxi for 40-50元, however traffic jams and taxi drivers quoting ridiculous off meter prices will mean this isn't a certainty. Taxis offer receipts that allow you to claim back expenses from your employer, if you have that in your contract, meaning that this could be the best solution for getting around.
You could consider buying an electric scooter at 1500ish second hand to 3000ish new. Your employer may even provide one of these for you when you arrive. If you have a drivers licence or are planning on getting a Chinese and don't mind looking a prick, at the moment you can rent a little electric Noddy car for 300 a month. Anything else just isn't value if it has to come out of your private fund. My employer rented a mid range VW but it was costing 4000 a month!
Some things are going to be more expensive here than they would be in Europe. Chocolate, cheese, milk, petrol, cigars, lamb, trainers, car rental and haircuts are more here than I found them to be back home. Apart from that everything else will be much cheaper than GB.
All in all, I don't pay rent, electricity or most of my transport but 5000-6000 slips though my fingers easily each month on food, ciggies, parking, nick nacks, the odd taxi and phone bills.
Giving you an exact amount would be neigh on impossible but hopefully I've given you an idea. You'll spend a lot less than you would back home and hopefully retain the same standards of living.