Short answers, pulled from the story.
Adolf Hitler wrote two chapters titled War Propaganda and Propaganda and Organization that laid out a blueprint for future Nazi efforts. He claimed he learned the value of propaganda as an infantryman during World War I while exposed to effective British campaigns and ineffective German ones.
On the 13th of March 1933, a Ministry of Propaganda was established with Joseph Goebbels serving as its Minister. His goals were to establish enemies in the public mind including external enemies who had imposed the Treaty of Versailles on Germany.
By the start of the Second World War over 70% of German households owned one of these radios deliberately limited in range to prevent citizens from considering other viewpoints. The Nazis sold cheap radios called People's Receivers for 76 marks while cheaper versions went for 35 marks.
Parole der Woche wall newspapers were published by the Reich Ministry of Public Enlightenment and Propaganda starting from the 16th of March 1936. Hitler personally appointed artist Hans Schweitzer known as Mjölnir with the task of translating Nazi ideology into images for the wall newspaper.
William Joyce first appeared on German radio on the 6th of September 1939 reading news in English but soon became noted for his often mischievous propaganda broadcasts. He was executed for treason in 1946.
Shooting of the film began on the 26th of February 1944 directed by Kurt Gerron meant to show how well Jews lived under benevolent protection of Nazi Germany. After shooting most of the cast and even the filmmaker himself were deported to Auschwitz where they were murdered.