Novice with a inherited setup

[KingMinger]

Hey all, I would like to preface that I have only just gotten back into physical media collecting in 2021 and since then I've acquired the necessary equipment being the 4k player, 4k TV and small collection of awesome movies.

Now onto the sound system itself. Ive inherited an entire sound 5.1 surround sound system and a Pioneer VSX-520 receiver. They have both been collecting dust in boxes for 10 years, I just finished dusting up the receiver and plugged in to see if it would even work and lo and behold it does. All buttons seem to work fine and I will eventually get around to test the speakers themselves.

Speaking of speakers the brand they are is called Dream Acoustics, which seem to be a now defunct(They don't even have a website, just an eBay page) Australian brand but Chinese made Audio/speaker manufacturing company. I assume the quality may or may not be the best but that is no issue for me, as I have never had such a system before.

I got 5 speakers in total, two towers, one center and two bookshelf speakers. My current room is not the biggest so I will just be using the towers and center speaker for now.

So I have some questions:

1) Will this old receiver work drama free with a 2021 Smart TV

2) I assume I will not be getting the Dolby atmos experience since you need Dolby atmos specific speakers and receiver IIRC

Also, does anyone on here not use Dolby atmos and just have a regular home theater set up of sorts? I assume the sound is still awesome when watching movies
Thanks in advance