The uniform pin is a Wound Badge - it was basically the German equivalent to the Purple Heart of the US. They had different versions of it that were given depending on how much you were wounded - for example the Gold Wound Badge was given if you got wounded 5 or more separate times in battle. The one you have is probably the Black (wounded once or twice).

The DDAC is for the driving club - kind of like the AAA.

The dagger I am not sure - it does not have any markings on it and I am unfamiliar with daggers by sight so I can't help you there.

DDAC is Der Deutsche Automobilclub, or "The German Automobile Club." This organization, a private association and maintenance provider for German automobile enthusiasts, was created during the Nazi period through the forced amalgamation of several similar automobile clubs. It was re-founded after the war and still exists today as ADAC (the Allgemeiner Deutscher Automobilclub, or "General German Automobile Club"), the German equivalent of AAA. This is not to be confused with the modern DDAC - a very small organization of female motor enthusiasts called the "German Women's Automobile Club" (Deutscher Damen Automobilclub). The Nazi-era DDAC is an example of the phenomenon of "coordination" (Gleichschaltung). After 1933, the various private organizations, clubs, and associations that constituted German civil society were either eliminated, absorbed by Nazi counterparts, or integrated into the structure of the Nazi Party - that is, they were "coordinated." Often, adding Nazi iconography to the visual identity of the organization was part of this process.

The uniform pin is the Wound Badge (Verwundetenabzeichen), which was the German equivalent of the American Purple Heart. In this case, you've got a Wound Badge Third Class - black, as opposed to silver or gold - indicating either one or two wounds received in combat or air raids.