Some advice: Stick to the course requirements and forget the fancy graphics. Save that for later when you have time to spend on it.
Displaying a PNG is non-trivial unless you are using modern versions of Windows (Windows 7 or better), because you would have to use the libpng and zlib libraries and perform all the proper transformations to a BITMAP to a displayable HBITMAP yourself.
If undaunted, google around "Win32 API tutorial" and then "GDI tutorial".