The first review requires the penal order, proof of service, the filed objection and every court response. The indictment request or other file information shows the factual basis of the allegation. Without these documents, the selection of witnesses often remains too general.
For each person, prepare a short chronology: connection to the event, date, place, personal perception and possible supporting facts. Messages, photographs, calendar entries, plans, work records or other contemporaneous documents should be kept in the evidence file where they were obtained lawfully.
Keep the documents in their original form. Personal summaries can help with preparation, but they do not replace originals and should not embellish a perception after the event. Witness preparation requires a clear separation between what the person knows directly and what was added later from other sources.