Is there a theme like the one has for new store creation

I am looking for a theme like the one uses for their new store owners to use when creating a new store. The wizard seems much simpler and less of a learning curb for new individual store owners. I am trying to make the new store owner experience as smooth as possible. If there is not one like that one available to us, ultimately what I really need is for users to just post an item for sale and I'll charge a % when it sells. Is this possible with the simple market or grid market theme without having the user to create a store of their own? I'll be using paypal chained payments. Thanks in advance for your help.