You'll need to answer the following questions and seek answers before venturing into the world of owning a coffee shop:
1) What do you know?
2) What don't know you?
3) What do you know that you don't know?
4) What don't you know that you don't know?
Question #1 will likely be easy. The other three get more difficult as they progress. The point is, seek counsel from someone who's been where you want to go. Find out all those things you need to know.