Zero to wine bar in $20K

You can quickly create your own wine bar with an Enomatic wine dispensing system that I found via this post on Luxist.  The system holds up to 20 bottles of wine, automatically dispenses the perfect pour, and fills partial bottles with inert argon to keep wine from spoiling. 

Find a retail space, buy a few of these things, buy some cool wine tumblers, apply for liquor license, decorate, come up with catchy name, repeat.