Report the crime to law enforcement
If you don't report the crime, you cannot exercise your rights. No investigation will occur. No one will be arrested and tried in court.
Law enforcement investigates the crime
They may interview witnesses, take photographs of the crime scene, look for fingerprints, etc.
If law enforcement thinks their investigation has gathered enough evidence, they will submit a warrant request to the prosecutor with suggested criminal charges. The prosecutor may ask law enforcement to do further investigation. If there is sufficient evidence, the prosecutor may authorize an arrest warrant.
Law enforcement takes the suspect into custody and lodges them in the county jail.