Perhaps you could talk about how the Nazis used German feelings of nationalism to gain support in the period between 1928 and 33 (E.g. appealed to the bruised pride of Germans after Versailles, promised a stronger Germany, etc). You could then perhaps talk about the impact of nationalism on foreign policy (e.g. lebensraum, Anschluss with Austria), the influence of German nationalism on shaping Nazi racial policy (e.g. anti-Semitism, Aryan Supremacy) and the Volksgemeinschaft. You could then talk about the war for 39-45... but since we haven't done much on the war in class (I need to study it... we only skimmed over it!) I can't help you much on that. I hope this helps.