Hello, D.!
I sell on ebay - at one time I was a power-seller and would've gladly paid someone to either take pictures and notes for me or do the postings.
In order to do this - the person will have to give you access to their account, etc. If they want you to have your own account and post - there are people out there that "supply" the items - however, you have to pay for the inventory and they ship for you....that has always bothered me as you can't be sure what they are sending (is it the right size, color, item, etc.).
IF you have to pay to do it - I personally think it's a scam - this is MY opinion. However, if the person is giving you access to their ebay account and having you post THEIR items - GO FOR IT!!!