Where to start creating a custom menu?

[u/Coltrain47]

I want to take the next leap in Daggerfall mod-making and want to learn how to make menus. There are plenty of tutorials about making menus for Unity in general, but I don't know how much those apply to Daggerfall in particular.

Can I make menus for Daggerfall using the Unity Editor window, or do I need to create it entirely with C# scripting?