So if you really want to do the work of a seasoned programmer you need to learn programming. This needs some weeks of intensive learning to acquire the basic skills. You also should consider a higher level language like C# or Java - depending on your target platfrom.
For showing something on the screen normally is the use of bitmaps the best and easiest way. In your app: a "non pressed key bitmap, and when pressed than exchanged with a "pressed key" bitmap. Like bricks in a wall you show an array of these elements.
When I search with Google I had found this simple but good
keyboard example in some seconds. (You only need to set suitable bitmaps on the buttons) Shame on you...