1. Take a professional distilling class.
2. Know and understand all and I mean all,the laws governing the sale of alcohol in your state.
3. Hire a consultant for a day, or invest in going to the ADI conference.
4. The still is the smallest issue of a distillery, capital and sales stream is first.
5. Business plan, business plan, business plan.
6. There is nothing wrong with a 55 gallon still, I started on smaller, but first identity what you want to make and design the still for it.
To me, the easiest conversation starting point is the equipment, but that, in retrospect, is the least important. As long as copper in in the vapor path and you know how to drive your still, you'll be fine. Just make sure you have enough capital to afford the screw ups, and or learning curve.
Best of luck