Have you thought about first opening an online store? It`d save you the costs for a brick-and-mortar place, and you could put the savings into inventory. Plus, you`d maybe get a sense of what people want?
One option that seems to be growing quickly and nicely is Bonanzle.
I would opt for an on-line store first before opening a brick and morter. If you are wrong and it won`t work, your going to save yourself a lot of time and money. If it works and is a great idea, you can always open a retail outlet. JMTC