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I would recommend focusing on your communications classes and learn design and web skills. Regardless of weather you take this as a career path or just have the knowledge to understand design and how it work it will be invaluable to you in advertising. Start looking for internships or volunteer for events. This is a great way to get experience on the ground level and scale to making a stipend or paycheck quickly.
Any experience in the professional world will make you more marketable. An internship is the ideal route to take, but you can also volunteer your time especially if you have any contacts in that field so you can gain some experience. Try to also do some networking in the meantime. Your resume will stand out and show your dedication if you've put in time and effort.