I found the first thing I did to be most helpful, even tho I couldn't find it again for awhile to update it.....that is the Sellers Details/Profile....
I don't know but it seems like the place to start, then do "JUST ONE" on the Master profile using the Seller Profile. I had a dozen or so for awhile and now I only use one and just change the description and pics. Once I feel confident I will make more tailored to each item. Currently mine have been all miniatures...so it's been great.