An informative essay must contain actual fact, examples and must be supported.
Choose the topic about which you want to talk about. Do not try to cover everything about fear. You may mention them in an introductory paragraph , but you will need other paragraphs to develops the main them and the main idea of the essay.
Focus on the information that you have obtained from different sources, analyze them. Usually an essay should have at least eight paragraphs. After the introductory paragraph where you may mention the general topic, in the following you must star to develop the idea of the fear you want to talk about.
Mention the facts and example. Then summarize and write a closing and a conclusion. Always supporting your statements