You can present your experience in different ways. You can write a paragraph with your experience, type a list of your jobs, tell a story, or anything you can think of. Be creative and always keep in mind that you want to catch the reader's attention.
Include the type of recordings you have done in your prior jobs and how they were used. You can write company names, locations, dates
Show how you learned to be a voice over. Include college degrees, classes, workshops, seminars and any type of activity where you learned about doing voice overs.
Include other type of studies that are related to the voice over industry, like performing arts, music, communications, media production, journalism, etc
Write anything you think is important for clients to know about you or your career. This information will help them know if you will bind with the project.
Include skills in activities that support voice over services.
You also may want to write about skills or knowledge related to other careers or jobs you have had and that you feel are worth telling clients.