All good points by @LocavoreStore most importantly “don't rush it”.
Remove any romantic notion about owning a coffee shop from your mind - it's a business like any other business, it just so happens that you will be selling coffee.
Do a Google search for Startup Cost Calculator - this will give you a great picture of the costs involved in starting your business.
Start with the menu and work backwards - the menu will determine your equipment, the size of your kitchen the layout of your bar and the general floorpan for your space.
Hire an architect or commercial interior designer that has experience working in your city - ADA and local building code requirements can be daunting.
Your logo, signage and website - hire a professional to do that work.
Establish a relationship with a commercial realtor that can negotiate on your behalf, make sure they do not represent the landlord but represent you for the best deal.
Educate yourself - two recent books I’ve read:
Colin Harmon's What I Know About Running Coffee Shops. Its full of in-the-trenches examples of him starting out and growing his business.
Profit First by Mike Michalowicz - this should be the standard accounting format for every business.
Plan the work and work the plan - all the best with your venture.
