Go to the following Pinterest link to see a variety of advertising photography.
Day 1: Research Advertising Photography. Find out what you like and what you don't like. What would you like to photograph and then think what are the possibilities that you can photograph it (We don't live by the ocean, so I would not have photograph an ad including an image of the ocean as a reasonable goal for this assignment). What props do you need to take your pictures?
Day 2: Make it happen. Set up and photograph your subject. Take many pictures so you have lots of options.
Day 3: Edit your image on the computer. Photoshop is your friend :) .