how to convert Java coordinates to JOGL coordinates

How are you all?

please, I have two problems in my graduation project.

First,
I want to translate from java 2D coordinate system to JOGL 3D coordinate system.

second,
how to get the graphics of the texture to draw on it?

Note: the whole idea that we have object in 3D environment, this object is drawing stand and we want to allow the user to draw on the stand.

I attached screen shoot of our environment, so please if you can help me

Thanks in advance.