I currently hold a Z visa as a director of Education at a college here in GZ. Next year I may not be able to get a renewal of my foreign experts certificate and Z visa renewal due to my age. Several companies in the US want me to live in China and be their Chinese rep to purchase goods for them. How can I stay in China to work as an independent sales rep and what kind of visas/permits should I apply for. What do I need to supply for a the correct visa? Do I need to establish a business here?