Real demonstrative and circumstantial evidence

You are the commander of a csi unit. The unit is only a couple of months old. And the members of the unit are new and in need of traing from the ground up. The chief of police requires you to use your experience to establish a training program for the new members of the csi unit. The chief requires a proposal on what training you will be providing the unit team. Only a short proposal needed. What is the difference between real or physical evidence and testimonial evidence? Provide 5 examples of real or physical evidence that may require explaination in court court by u because u are the one recording, recovering, processing, and packaging the evidence u recovered. Why is real or physical evidence important for the jury? What is demonstrative evidence and why is it used to clarify issues in trial? What is the difference between direct evidence and circumstancial evidence? Explain. Can it be enough for a conviction? Why or why not?