You need to explore the use of inventory system and 3000 sq feet for a start up is a real killer if you can't bring in the dough. It's probably better to start off with a 500-700 ft retail space as you need to invest in inventory and inventory softwares.
Starting a bar is a big business. You require at least 400K to start off with the initial renovation cost, rental, inventory etc. It's probably not a wise thing to do if you've not been in this field before as hiring the right people, doing the necessary marketing is crucial later.
I think you should focus on the business model, the products and measure it's probability of success by having a proof of concept. You can start a simple business with less than 2K but it all depends whether the business will take off.