the basics
Just perfect the basics, if you can do that, and do it "correctly" then you are light years ahead of the competition. Something I've said from day one getting hard core into this industry, if I order an espresso that takes more then one comma, shoot me dead, lol...
choices are going to overwhelm your croud, yeah, play around with a "special" but your initial goal is selling the basics, and proving to people, a $3.00 cup of coffee is worth it if they are buying it from you.