Hi mate,
I can do this for you. I have set up signal servers before for other clients and I also use signal in my day to day life aswell so I am aware of how it all works.
I am a native english speaker, so communication won't be an issue.
I estimate it to take two days, all I need from you is the Ubuntu Server + Domain name to be used (to ensure we can get HTTPS working correctly).
Let's chat about this more in detail via chat,
Regards.
Harry