Who are your target users, people using Etsy or eBay? Are you competing with other services like those on ease of use alone? For people looking to buy things, will you provide some search across all users or are you just giving your sellers a link they can promote?
At first, to overcome the chicken and egg problem, it will be "bring your own traffic". As we grow, there will be global directory with search, with emphasis on your local shops.
Who are your target users, people using Etsy or eBay? Are you competing with other services like those on ease of use alone? For people looking to buy things, will you provide some search across all users or are you just giving your sellers a link they can promote?