@bigetownky Stash interprets each individual video file as a "scene." The "films" section is intended for organising individual scenes into the full film. For example, you might have all 5 scenes of a DVD as separate files, so what you can do is create a film entry and then add each scene to it. Doing it that way means you can easily search for a particular scene yet still have them grouped together as a single film. You can also add in the DVD covers, description, rating etc for the full DVD while keeping the scene covers and information.
As for getting all the data, it can be a lengthy process. Click on a scene, and then click on EDIT (below the title on the left.) You should then see a blue button with "Scrape with" on it. Click that and select "Stashdb.org" and it will check to see if there's a match in the online database. If there is one you'll get a new popup that shows all the data they have. Check through it all, because sometimes it'll pick up the wrong title or something. If you're happy with everything then just click APPLY. Don't forget to hit SAVE on the left of the screen afterwards. You can do all of this in batches too, but like I said it can be a little bit time consuming at first. It's not too bad as long as you remember to do it ever so often so you're not having to check hundreds of files.
Don't get discouraged if there's no info for the scene you're looking for. Obviously not everything is catalogued yet. There are lots of scrapers you can add, so you can get it to scrape a studio's website rather than the Stash-created one, which is great when you know the source of the video.
I don't pretend to know nearly as much as I'd like to know, but if you join their Discord there are a few really helpful people there. One of the Stash team even spent 3 hours debugging a script that wasn't working for me. (It still doesn't work, or I'm doing something else wrong, but he certainly tried.)
https://discord.gg/JFGrZBev (The link expires after 7 days, so if anyone has trouble let me know and I'll generate a new invite.)