That is a GREAT GREAT idea!! I dream of doing that too one day. I wish you the best of luck and hope you are successful. Be sure to tell us where it is so we can visit
As for advise, I think all natural, organic treats would be the way to go
Also really cute clothes in several sizes, and things you have to order online like carseats, strollers, like someone else said. I also think having a little playroom would be a good idea