what documents are needed for one to visit china on business, how do i get hold of manufacturers

where do i get the information about stationery,Information Communication Technology (I.C.T) and office equipment manufacturers and wholesalers when i visit china. what about the information regarding the freighting of containers from china, the costs of transporting containers, various taxes to be paid, how they are paid.how long does it take for a container to reach Zimbabwe from china.any other information regarding the exportation of stationary, I.C.T products and other office equipment machinery.