First you need to figure out what kind of app you want to create. Then you need to figure out how it can benefit someone. Next you need to figure out how it works. As you figure out things about your app you can make notes on a piece of paper so you dont forget. When you know a few things about your app then you can split them into paragraphs. One paragraph about your apps uses and one about how you came up with the idea for the app. Write your body paragraphs first so it will be easier to come up with a intro paragraph and a conclusion paragraph.
