Please help me on how to start this essay prompt:
Examine a Centers for Disease Control advertising campaign that promotes the influenza (flu) vaccination. Analyze the campaign to discover the target audience and the advertising techniques used. Then evaluate the effectiveness of these advertising techniques. Write a five-paragraph essay in which you explain how the advertising campaign effectively promotes the influenza vaccination to a range of audiences.

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According to CDC (Disease Control and Prevention Center), influenza (flu) is an infectious respiratory disease caused by influenza virus infecting the nose, throat, sometimes the lungs. Influenza A and B viruses are the two main types of human infections. Influenza virus is active throughout the year, but in the US, the influenza season starts from around October and lasts until April with peaks peak in December and February. With this in mind, somewhere in September and October, we need to start thinking about ways to protect our children from the flu. This is particularly true for parents of young children who are at high risk of developing influenza complications. With appropriate precautions and cautious treatment, the disease may be mild.

Explanation:

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.