Thanks and thanks for the "ortho" tip.
I finally find some good starting stuff on http://wiki.delphigl.com.
In the future I will probably use SDL or something like that, but for now I want to use raw OpenGL, because I want to really understand the basics.
And rendering a simple bitmap/texture cannot be difficult, I presume.
I know I do not need any of the VCL stuff, but it's an easier start for testing/learning.
I'll probably come back here to ask further questions