There’s not much harm in trying it out 
Some thoughts:
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Plex doesn’t support disc images (e.g.
.isoor.dvdmedia) and raw disc folder structures (e.g.VIDEO_TS) – Plex is focusing on the actual movies and will present local extras you add to your files in its own UI
https://support.plex.tv/articles/201426506-why-are-iso-video-ts-and-other-disk-image-formats-not-supported/ -
Beyond those not-supported formats, it’s worth to spend a moment in reviewing your file naming / folder structures. This will help Plex to recognize your media as the movies / tv-shows they are and automatically load their respective metadata and artwork. If you feel this is too much effort, there’s apps that’ll help you fixing your organization automatically (e.g. Filebot).
https://support.plex.tv/articles/naming-and-organizing-your-movie-media-files/
https://support.plex.tv/articles/naming-and-organizing-your-tv-show-files/ -
If you’ve wired your machine through HDMI to your smart TV, you might want to check out Plex HTPC (the to-be successor of Plex Media Player which has a number of new features not available in Plex Media Player)
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It might be worth to check if your Smart TV has a native Plex client app in which case you can use that instead of wiring the PC to theTV (unless you want to use it as a HTPC)
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There’s a whole load of helpful support articles on how Plex works (from technical guides to feature overviews and comparisons between the regular/free version and Plex Pass features)
https://support.plex.tv/articles/
