Officers should prepare to write police reports by bringing writing materials to the scene, observing details, and taking thorough notes. Important information in a report includes what happened, statements from those involved, investigative actions taken, contact information, evidence handling, and legal details. When writing reports, officers should include specific details to establish probable cause, describe individuals, explain injuries and evidence handling. Effective interview tips are dealing with emotions first, providing privacy, asking for clarification, and using quotation marks for exact statements.