How to draw my own GUI for minecraft mod 1.12.2?

I can't quite figure out how to properly draw my own gui using this:

import net.minecraft.client.gui.GuiScreen;

public class NewGui extends GuiScreen {
	public void initGui() {}
	public void keyTyped(char c, int i) {}
	public void drawScreen(int x, int y, float f) {}
}

I already tried to do something, but I could not achieve my goal.
I have a desire by pressing a key that is registered in the client to open the drawn gui using the simple drawRect, drawString, drawCenteredString, drawHoveringText.

I using MDK version: 14.23.4.2705

Edited March 21, 20223 yr by horizon973