Take a topic specific to these disorders and expand on them. Dosome independent research that can include: Films, YouTube,research articles, books etc.
some examples can include:
-Treatment for adolescent substance abuse/dependence
-Evidence based interventions for Trauma cases
-Correlations with other disorders
These are just examples, up to you what you chose to researchand what you chose to inform the class on.
As always I look for quality, if you do research that is peerreviewed please cite work.