If you are really looking for facts that have to do with Germany during WWII in the 1930s, there will be very few such facts. That is particularly true if all your facts need dates with them. The reason for this is that WWII only started in September of 1939. That means that only four months were part of the 1930s and part of WWII.
On September 1, 1939, Germany invaded Poland. That was the start of WWII in Europe.
On September 27, 1939, the Polish government surrenders and German divides Poland up with the Soviet Union.
These are the only two really major events that happened in 1939 and were part of WWII. You could also say that Germany started using submarines (U-boats) to sink Allied shipping in September of 1939. The first ship sunk by German submarines was sunk on September 3, 1939.
There are many other facts about Germany in the 1930s that sort of have to do with WWII but are not actually part of the war. For example, Adolf Hitler was appointed as Chancellor of Germany on January 30, 1933. This was very important in causing WWII to happen, but it did not actually happen during the war.