Pete
You can add single items as well as send a new list for them to upload. You need to go to the Seller/Affiliate section as mentioned below
To change any settings go to MY ACCOUNT, click on Seller/Affiliate: on the top left hand side, then scoll down and go to Change Preferences / Registration
It does take a while for an uploaded list to show so don't panic yet
Not sure about how to categorise them on an uploaded list, sorry