Please tell me what documentation is required?

Please kindly give me some information. I'm going to go to China with my wife in the next month for period of six month with Iranian Passport to sabbatical live and i have a invitation letter on the other side. I can receive 4500 Eur from this side to living expense there. I appreciated very much if you tell me this amount of money is sufficient to living expense in the Xuzho city?