Gerhard Buchwald, JU 52 Pilot

I am Looking for information on Gerhard Buchwald. He is my pen pals father. I have been pen pals with his daughter since late 1968. He is from Kreis Frankfurt/Oder area and was before the war. Born in what is now Poland. He died in 1982. He was a prisoner of the Russians for 5 years. I visited East Germany at times and talked to him and had a personal tour of the battlefields in the Frankfurt/Oder area.

I would like to learn about his service for his daughters and wife who is still alive if I can. Not sure how to proceed. As I am new at this any help would be appreciated. I do speak German.
Yours,
Vince