Create game-like Full-Screen

[Cadere]

Hello,
Excuse my Englisch, My German is awfull, but I can read it.

As a self-educated programmer I'm trying to write sort of a game in Delphi.
For that game I want a fully black screen, where I will draw figures etc, etc.
<ESC> goes back to normal screen.
I don't get it done... lost in bitmaps, canvasses, images, windowstates etc...
Can somebody help me out?

T.I.A.
Cadere