Does anyone know what type of visa I need?

Hi, my employer is asking me to travel to yangzhou where i will stay for 1 week, before i reside in beijing. She has not told me the type I should be applying for, but on my invitation letter it says reason for visit to china 'performance'. Also on the invitation letter it says the inviter is my employer, which automatically makes the application into a Z ype. This all makes sense until the work permit comes into play. for a Z type, you need a work permit? Well I haven't been provided one from my employer nor PRC... Does anyone have any suggestions for me as I am due to fly out to Yangzhou in the coming week. Thanks