Summary: You need a resume.
You need a good one because you are going into advertising or staying in advertising. What do you do to get one? You could do it yourself or you call the resume service. We went to our search engine of choice, selected an area, and found (on the first two pages) 56 resume services. One had “professional” in its name, one had “executive” in its name. We could find none with “professional” and “executive” in the name, so if you want to be professional, look for the former; if you want to be executive, choose the latter. If you want to be both professional and executive you may have to start your own resume writing service.