Look at Sonarr, Radar, and Sabnzbd. There are a bunch of guides out there, but running via docker is probably the easiest. Then swing by the newsgroups subreddit wiki https://old.reddit.com/r/usenet/wiki/index (I’m sorry it still has the most comprehensive details for this stuff).

Basically, Sonarr/Radar finds the nzb files, then Sabnzbd downloads them.