Easy, get automation software like Radarr for movies and Sonarr for tv shows, add indexers like Drunkenslug to them, install and connect SABNZBD as the download client to Sonarr and Radarr and lets roll
Nah drunkenslug is an indexer. You need both an indexer and provider to use usenet. Indexers normally cost money via a donation for lifetime or 1 year of download privilege.
Providers you pay for via different plan types. Some sell “block” accounts where you get XGB of download and once it’s gone it’s gone. Some have a subscription model with a bandwidth allotment. Some have pay a flat fee for unlimited access. All depends on what you’re willing to pay.
R/usenetproviders has a wiki but I recommend Eweka or NewsDemon