Help in tracking German roots
I am recently new to this. I have one branch of my family in particular that I am interested in tracing. I am having real trouble getting started as my maternal Grandfather came over to this country after fighting in The Great War for Germany. He had brothers and sisters who had children and I find nothing on any of the US sites as most of that info seems to be for immigrants who came here.
What is the best way to find info in Germany?