As a seasoned detective, what would your advise Jones, the first responding officer, to do until you arrive?

Deputy Jones received a call to respond to a domestic disturbance in the parking lot of a local Wal-Mart; there have been possible shots fired. When Jones arrives, she observes a woman lying in the parking lot in what looks to be a pool of fresh blood. It also appears that here may be a gun on the ground next to the female body. The contents of her purse appear to be scattered all over the ground next to her. There is a small crowd of people standing around the body of the woman. You are detective unit #1, and Jones has requested that you respond to the scene as soon as possible. You have advised that you are en route to the scene, and will arrive in several minutes. Jones, a rookie, is confused and a bit excited, and is asking you on the radio what to do. As a seasoned detective, what would your advise Jones, the first responding officer, to do until you arrive? Are there concerns regarding the loss or destruction of evidence? Are there safety concerns? What should the first responding officer do upon arrival at a crime scene?