Hello Shamrock,
I can assist, am in the transport and logistics industry. If you PM me the details of your goods, I will be able to classify them for you and give you the rate of duty. The calculation from Joe is spot on.
If you PM we with you e-mail address I will e-mail you a document that you may find usefull when starting out in the import field.
If the goods come by Ocean, do not leave the shipping arrangements to your Chinese Supplier as you will get hammered with charges on this end.
Cheers,
Rudolf289