Welcome..
I was surffing the net looking for gdl tutorials. Unfortunatelly I didnt manage to find anyone which would describe how to create new object from a very beginning. Im familiar with pascal and qbasic ..
Anyone knows where could i find some proper for that tutorials?
Ones in which you write the object from nothing?
Canada's Graphisoft distributor is GSCNE in Mississauga, Ontario. They published a small blue book many years ago that was excellent in describing the beginning steps of writing GDL code.
It is pretty old, but so is your Archicad version.
They have a few left.