As far as I know, main documents required to import into Asia are:
Quotation, Sales contract, Pro Forma Invoice, commercial Invoice, Packing List, Inspection Certificate and Insurance.
You can find the full list here: http://hong-kong-economy-research.hktdc.com/business-news/article/Small-Business-Resources/Common-Import-Export-Documents/sbr/en/1/1X000000/1X006MLL.htm