YouTube is a great resource for finding speeches, as well as other audio and visual clips from this period. Just enter some relevant keywords, like Pétain, de Gaulle, French resistance, Vichy France, French collaborators, etc.
Use the links below to find books on your topic. Some relevant subject terms (can also be used in a keyword search) might be:
France and History and German Occupation, 1940-1945
World War, 1939-1945 and France
perhaps combined with one of these terms:
Reference librarians can help you select relevant terms and a good search strategy for your topic.