Metadata is needed. You need to set beforehand what is queriable via DV.
I’d advise you look through structures laid out in demo vaults, such as SoRobby’s:
Look at what he has available 1. at the query level (Dashboards), 2. note level (notes with metadata) and 3. template level (that would make the notes to be queried), 4. look at what plugins are installed and enabled and from the readme page, how the structure is organized.
Tip: he has Buttons plugin buttons in the dashboards which you may have to change for Meta Bind plugin buttons for the long run as Buttons is a discontinued plugin.