Customs Assistance for Goods Import from China to America

I already have a customs broker on this shipment. They are asking for a lot of documents and HS codes and things like that which I do not know off hand. The shipment has 20-50 items (40FCL) and I would like to hire someone to handle communications with the customs broker and gathering all of the information which they will need.

You will need to go through my alibaba account to get the necessary information and create a spreadsheet + fill in some documents.