Hello! Making an outline is so simple! Let me break it down for you! :)
First you are going to find a topic and write your thesis (the main idea of your essay or what it is going to be about). Next research the topic and make kind of a list of everything you wish to discuss in your essay. Make your main points headings in your outline. Arrange your data in a logical, chronological and numeral order. Then revise and and adjust!
Hope this helps! Let me know if you have any other questions! :)