It would take some serious marketing, SEO and patience.
I think most people would still look at ebay and because of the enourmous product range and they are probably more likely to find what they are after.
do you already have items?, that would be another problem convincing people to use you other than ebay, especially when you have no other sellers.
www.stickybeek.com.audoes something similar in my area. they sell on consignment for car dealers etc.
Maybe you could approach some second hand furniture stores and offer to sell their stuff on consignment.