Help!! How can i script and make a editor tab by my self. (Cs)

Hi

I’m understanding now the basics of Cs Scripting and want to go to the next step and that’s for me making a tab in the editor from where you can control everything from the player and cars and all that stuff.
But I have no idea of where to start plzzz can someone tell me where I can begin the best.

Something like this.

Just make a script that extends EditorWindow