rammjet

Definitely use Docker. Here is one method. You can search for others.

https://pimylifeup.com/jellyfin-docker/

Been using Zoho mail with my domain for years.

https://www.zoho.com/mail/help/email-forwarding.html

You have to have APN setup properly with settings from your carrier. Do a web search for your carrier + iOS + APN

https://support.apple.com/en-us/102483

Adding a VNC server and a Zerotier private VPN allows you to quickly provide support remotely. I support 8 different computers this way from hundreds of miles.