Nerds like to argue but this the easiest set-it-and-forget it way is to get a raspi or old PC and put some home server OS on it like CasaOS, Umbrel, or TrueNAS. Then get the following apps:
- Torrent app like Deluge or qBittorrent
- Prowlarr - Searches torrent sites
- Radar - Manages movies
- Sonarr - Manages television shows
- Plex - organizes downloaded media and streams to your devices
- Overserr (optional) a friendly GUI for requesting media.
Trash guides are useful for getting it all set up. There is a learning curve but once it's up and running you don't need to think about it.