Creating onscreen button

How would I go about creating a button on screen that is there all the time, so when I hold down C and release my cursor I can press on it to do something, any links to something like this or garry’s mod wiki would be appreciated, I’ve got no idea where to start.

Google GMod VGUI

To begin with you might want to learn how Derma works. https://wiki.garrysmod.com/page/Derma_Basic_Guide

By the sounds of it you want to know how to incorporate it as a HUD feature. You might struggle to begin with.

Guide is slightly outdated, but I used it to learn, and worked out fine.

If it is all a mind fuck, you can always try

But it is always good to start learning with the small things early.

Thanks guys <3 Got the basics of this down.