Chinese developer in Objective-C

You are Chinese, you speak English, you live in Shanghai, you know Objective-C, Cocoa and iOS, and you have experience with iPad, iPod Touch and iPhone. We are a French IT services company that develops applications for iPad. What have you done and where can we see these achievements. What is your price depending on the amount of work done? For example, how many do you ask for a task of 4 weeks, how many do you ask for a task of 6 months or more? Give you an invoice? If there is no invoice then the prices charged will be lower because of the risks we take. How do you want to be paid: PayPal, Money Gram, Western Union, etc.?