How to start the scraper?

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The three main culprits of not finding anything are 1) permissions, 2) naming conventions, and 3) wrong library type.

For 1) just make sure the user running Jellyfin has permissions to access the files.

For 2) check the naming conventions for the various library types. For something you don't expect to find metadata for, movies or home videos/photos are the best choices. Turn off any metadata suppliers that you won't need if using movies.

For 3) be careful about sub-subfolders. The two acceptable routes are:

Library Folder > Movie/Series Folder [> Season Folder] > Media
Root Folder > Library Folder [A, B, C...] > etc...

You always add at the library folder level. If you have multiple subfolders for movies, you won't find much. If you have non-matching folders for series (e.g., just a year, names of animators), Jellyfin will struggle to pick things up. You can organize by things like year or season name if you'd like, just make sure the folder includes "Season".