Please help me in my project

Hello everyone, I'm new to AI.

I'm working on an idea in which I want to build a ultra realistic Ai human digitally which I can control and manage from an admin panel and make it do anything by prompts.

And also I want him to call users voice and video both and talk in real time while maintaining ultra realism.

How can I do that and what are the things I need to learn for this ? And is this even possible?