Hi Jason,
You can use Micrsoft-365 program to get the right graph query. You can add test users, sharepoint site and more . You can avail this at https://developer.microsoft.com/en-US/microsoft-365/dev-program
Once you sign up, you can login to Graph Explorer and try it.
https://developer.microsoft.com/en-us/graph/graph-explorer
This can be utilized for 92 days.
For utilizing Graph api in an application how ever, you will need to register an app and get the Client ID and secret to get the token which is needed to utilize graph API, if you are looking to create a test scenario for this then you may have to create 1 yourself. You will need an additional test tenant to try this.
Let me know if you have any further queries.