You're trying to make a website, so you'll obviously need content. The files that make up your Fusebox application are broken down into a few different categories:
The Fusebox "core" files, or files that act together to provide the Fusebox functionality.
Display fuses, prefixed with "dsp", are used to show information to the user.
Query fuses, prefixed with "qry", contain all your database queries.
Action fuses, prefixed with "act", typically perform some kind of action, such as emailing someone with the mail() function.
Location fuses, prefixed with url, redirect the application to a new URL.
Keeping the responsibilities of each type of file in mind, it should become apparent how to properly fashion your FuseDocs. A good rule of thumb is to make sure a developer who knows nothing about the overall application can code each fuse based entirely on the fusedoc.