Essays / Am I allowed to write description of the commercials in the first paragraph? [4]

I'm not really sure if I am allowed to write descriptions of TV commercials in the introducing paragraph, or if I should write it in the next paragraphs. I'm really comfused. Can anyone help me?

Select two TV commercials you know. Compare them as for general strategy of how to attract consumers and as for target group. Which one is the most efficient? (Comparative type of essay)

Thank you for your posts.