Choosing a topic that you know a lot about will help you write an informative essay. The more you know about a subject the less information you have to research. Information that you know is true is also a plus because not all sources are true and could be misleading.
Sample Informative Essays
One of the best ways to understand how to write an informative essay is to look at how someone else has already done it.
How to write an informative essay - SlideShare
Creating an outline before writing the first draft helps the student-writer narrow the focus of their Informative Essay. Since the student-writer is generally limited in word count, they are not able to write an Informative Essay that includes every possible factoid that pertains to or explains the subject being examined. This means that the student-writer must be brief as well as fair as they possibly can in how they select which information to include into their Informative Essay. They are to inform the reader about a subject without being overly broad; but they still should present their subject in a manageable, focused manner.