Worth mentioning that NZBget is no longer in development. It still works but there is a fork out of a new client someone is developing. I can't recall the name but easily findable. This would be the equivalent of your torrent client.

It's nearing year end and you can get end of year deals soon on providers and indexers so off hold off until November\December. I think I got a lifetime NZBGeek membership last year for like $100 or something. It was my first time doing usenet but I actually switched my instances to use usenet indexers first over torrent indexers its that good.

There's a few recent guides on Reddit that discuss this and automation. I got access to some private torrent trackers this year, but haven't touched them since I got my Usenet subscription. I've been waiting decades for it to be this easy once you get it set up.

If you already have that automation part going, this should be pretty straight forward. Add a Usenet download client to your *arr programs, put in the account info from your Usenet provider, add on your account info for nzb trackers, and it works just the same except with more consistency and speed.