Don't get carried away with props. Content is the most important factor, and any props used should be directly related to the theme. Remember that performers have only five minutes to set up and take down their props. Prepare the costuming. Use the most authentic costumes possible.
Good costumes help make a performer convincing, but be sure they are appropriate to the topic.
Consult photographs or costume guides if unsure about appropriate dress. Prepare the blocking. Students should think about these movements when deciding what type of set to design. Work on the delivery, speaking clearly and pronouncing all words correctly. Practice voice projection so that the judges and the audience can hear every word.