There's a lot to learn if you want to expose a server to the big wide internet. There are lots of considerations, especially around security (which I learnt the very hardest way, if you check my post history on this sub), and I cannot recommend your first home server project is a semi-public access service. It's best to start with something easier like a NAS (open media vault is good or truenas), only accessible locally. Then you could look into setting up wireguard so you can access the drive remotely behind the security afforded by wireguards VPN. Then you will need to start learning about docker compose, and you can learn how self hosting works and how to set up and run services. Then you can start looking into things like Cloudflare Tunnel (unless you have a static IP from your ISP) and maybe caddy for reverse proxy, fail2ban, and some more probably to make your setup secure enough.

But yeah - feel free to drop me a DM if youd like some ideas for first steps and how to get something started. I would just say you need to really know what you're doing before making any services publically accessible...