Hi, company i work for in USA signed an joint venture agreement with a company in china.

i am asked to work in china for the joint venture between USA company and Chinese company.
how do i legally work in china, how to get work permit
what are my responsibilities for anual sallary of 100,000$ US
what are the companies responsibility for the 100,000$ US sallary
what is the best way of employement payment? some paid with in US, some paid in China?
what would be the taxes i am required to pay to china
what is the taxes paid by the company for me in china