Newbie wants to make a good first 3D game?

Hi, so me being a noob I wanted to know where I should start. See I have a big dream for an open world with loads of mechanics in it. Some people said a 2D game some said 3D so I'm wondering where I should truely start as a brand new person. Also when making a game whats the steps you should take to complete it?

Where can I go to find good videos to teach me all I should know for an open world?

Thanks for for any feedback.