Low Budget/Low Power Home Server | Using Beelink MINI

Check out Eneba for cheap games: https://www.eneba.com/us/?af_id=EVOTech1
5500U Mini PC | https://amzn.to/3B8ajtW
Beelink Mini S12 | https://amzn.to/3Zw98i5
Beelink SER6 6600H | https://amzn.to/3IQENoU
ACEMAGICIAN Mini PC | https://amzn.to/3YT0CJc
Beelink SER5 5600H | https://amzn.to/3Xc5E2W
Beelink SER6 PRO 6800H | https://amzn.to/3YP8An1
Beelink SER5 5560U | https://amzn.to/3FLN8JB
4TB 2.5in SSD | https://amzn.to/3j7quSJ
4TB m.2 Nvme SSD | https://amzn.to/3wqB62o
Premium 4TB Nvme SSD | https://amzn.to/3JfOIVP
32GB of RAM Kit | https://amzn.to/3XV5ltK
900P Monitor | https://amzn.to/3GXiNGI
5500U laptop: https://goto.walmart.com/c/2797122/565706/9383?veh=aff&sourceid=imp_000011112222333344&u=https%3A%2F%2Fwww.walmart.com%2Fip%2FHP-Pavilion-15-6-FHD-AMD-Ryzen-5-5500U-8GB-RAM-512GB-SSD-Horizon-Blue-Windows-11-15-eh1052wm%2F531869839

Hi, wanted to ask here about the security of opening a tiny server like this to the internet. I want to host a small family minecraft server and have another single house access my plex library. Considering this is my first proper foray into hosting a server I wanted to know what other things should I worry about.

Initially my first worry is if this would make it possible for an attacker to access other computers on my network, and if so what could I do to avoid that. It’s my plan to, in the future, have a NAS in my home dedicated exclusively for our family photos and documents, is there anything I need to prepare for with other hardware? Or is just opening up this machine for games and media playback ‘sufficiently’ safe?

Eh, I've got a raspberry pi 4 2GiB serving me Docker with pihole + x2 unbound, firewall while (also) playing a live stream 24/7 through a small display and everything werks as intended. And theres still enough space for a retro gaming station, a webtop and even as a streaming serviceif I wanted to.
Oh, and the power output is registering under the 3W mark.

I have this as a plex media server connected to my nas drive, and it works, no issues so far 😊