Question on setting up Jellyfin on my existing Porkbun domain

[snipy3]

Hello. I'm new to this whole thing, so bear with me. A lot of tutorials I see have users going down the path of DuckDNS, etc. I have yet to find a good tutorial that demonstrates how to setup a Jellyfin server on an existing domain (from Porkbun in particular), as well as one that discusses the potential security risks of doing so / how to limit access. I am running a server on my laptop and it works fine in my house, but I'd ideally like to host it on my website so I can access it remotely and invite friends and family to use it as well.

Is there a good guide for this that I could reference, even if it's not 1:1 with my setup?