I'm also interested in hearing people's experiences with this!
Julia, may I ask about the current costs you have noted?
My initial thoughts on costs are
Direct
Coffee Machine
Grinder
Cups, cutlery etc
Food Wastage
Indirect
Accounting s/w and/or personnel.
Company registration costs (we have these in the UK, most likely there will be some in the US, similar to what I've seen discussed in
PC Club reviews about the setup process for tech businesses)
Staff Costs
Maintenance of machines (+ contingency for breakdowns etc)
Building Maintenance, Bills & Cleaning
Building works
(Future) Expansion costs
Advertising
Website
Hard truths: If you don't currently have a customer base or interested groups I'd consider this a J-curve business i.e. lots of money spent before returns are visible ...- if anyone is making a profit from a coffee business, please let us know how long it took to break even.
tips from other business ventures (you may already be doing this) - I'd highly recommend getting your business on google maps, gumtree (craigslist US alternative*), and other sites. Google was hugely helpful in getting customers through the door for my former business (tennis racket restringing). One thing I found got repeat customers was giving a 10-20% off coupon. Ensure you ask for reviews! - it feels weird but will ensure you're seen on maps and new people come. You can also start a google business site (which was free, I imagine it still is?) before you pay for a complete website.
Although I haven't started a coffee business I hope these tips are helpful
Rooting for you Julia!
Coffee_Mad_Man
EDIT: *I keep forgetting US don't have gumtree but craigslist!
PS - leverage your facebook friends, start a facebook page and ask them to like it; plus join facebook coffee groups too - again this is just a suggestion.