focus on getting info on the aediles/duoviri from primary sources, your best place to start would be a source book on Pompeii such as "Pompeii: A sourcebook" by Alison Cooley and MGL Cooley or Sheltons "As the Romans did" both should be available at your school or your local library, barring those try a uni if theres one nearby, theyll provide you with good info on the role of the aediles/duoviri and allow you to base your assignment on primary material and not secondary