@[email protected] There is absolutely no way any starter will see that page and not be intimidated. I am a well seasoned selfhoster and even I saw that and went "Wow that's a lotta words and images on a single page."
Even arch wiki has sensible ToC with pages divided into what the current topic is.
@[email protected] You don't need a "NAS" per se -- just running a baremetal distro and using containers in it will suffice.
Further, while Nextcloud can work fine, I'd suggest not using it and going for individual solutions instead of something AIO -- NC is fairly clunky, and fairly slow comparatively. It's also PHP.
I personally use Proxmox + LXC/VMs in one Micro PC (i5-7xxx/24G), and Just Ubuntu with Docker compose in another(i5-6xxx/16G) alongside a couple of Oracle VMs. It works out fairly well.
For Digitizing paperwork and mail, paperless-ngx is a good solution. For your pirate ship, look into *arr solutions. jellyseerr -> sonarr/radarr -> bazarr -> jellyfin works fine.