How do I create a menu for an avatar from scratch?

I just started making avatars 3.0 and I don’t understand at all what I should do to create a diverse menu(examples of avatars 3.0). On YouTube, everything is told very non-gradually, I’m completely confused. Maybe someone knows really good instructions with explanations of everything that I will need to do?
Although, if someone can explain it all by himself, it would be amazing!
Action Menu (

found this. It shows both expressions and parameters.

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