...the school will help to do the work visa, but it's not free
[4/24/2012 11:14:14 PM] Them: would you accept that?
[4/24/2012 11:14:19 PM] Me: How much is it?
[4/24/2012 11:15:22 PM] Them:

about 4000-5000

[4/24/2012 11:15:33 PM] Me: RMB?
[4/24/2012 11:15:38 PM] Them: yes

What I have highlighted in red is utter bullshit. To do the work visa costs MUCH MUCH LESS! Anyways, why won't they follow the normal procedure of sending you an approved letter of invitation which you can present to a Chinese visa office/embassy in your homeland to obtain a work visa in advance of flying to China? I suspect they want to see if you're any good at teaching first. If not, they'll cut you loose on your travel visa in China. Typical training centre stingy practice - ONLY WORK FOR THEM AS A LAST RESORT.
And only an allowance for accommodation is not good either. They don't desreve any foreign teachers!