To write an essay first getting started through prewriting. When you start writing start with scratch outline then write the first Draft. Reviewing and Editing.
When you start prewriting write what ever you come to your mind about your topic. Questing what you think about your topic by writing down a series of question words like what, when, why and how. Then clustering another prewriting strategy can use starting your subject in a few words on paper. Then the ideas will come to you circle the subject and draw lines to connect them to subject. Make a list of idea and details.
Make the reader interest in your essay and express the central idea of an essay and layout plan of development of main supporting details for the central idea. Ask questions those you intend to answer in your essay