Summarize this article in one sentence.
Even though manga comics are visual-based, you still need a plot to drive the story. Think about the stories that you love to read, and how you can make your own contribution. Manga has a wide variety of stories, from horror to love stories, so feel free to let your brain run wild. The key is to be thinking about your story all the time. If you limit your brainstorming to just when you sit down to write the story, you're not giving your creativity the time it needs to build a good story.  Try starting with one idea on a piece of paper. Build off that idea by connecting dots to other ideas you come up with. Another way to get your creativity flowing is just to free write. Start with a word or image, and just start writing until you hit on something you like. Once you do, start developing that idea. Pick an idea you enjoy. Working on your own manga is going to take some hard work. If you don't pick an idea you love, you'll have a hard time motivating yourself to work on it. Once you have an idea for a story, you need to work beyond that because manga comics generally need more planning than a normal novel. You need to create an outline of how your story is going to move from beginning to end.  Start by figuring out the main plot points. What's the driving force of your story? What are the major events? Make sure to include setting, as well. Think about the background you want for your setting and how that will affect your story. For example, an urban setting is very different from a rural setting in terms of story. Move on to going scene-by-scene, so you have an idea of what the main scenes will look like. When creating your characters, you need to think both about their place in the story (personality) and their physical appearance. To keep them consistent throughout your story, you should develop character sheets that outline both types of traits.  For appearance, you can simply draw the character in a model or turnaround sheet. Basically, you draw the character from every angle, figuring out clothing, hair, and proportion, so that you can recreate the character in the same manner throughout your manga. You can also create a 3D model using something like clay instead. For their personality and personal traits, write down traits for the character, such as personality quirks, personal beliefs, religion, favorite foods and color, and so on. Don't forget things like personality flaws. No one is perfect, and no character should be either. Also, think about things like motivation.  Create sheets for all your characters, but make sure your main characters are the most fleshed out. Really, developing a style comes from drawing for a while, and using your creativity to figure out what you like. However, it's important to pick something that's doable. You don't want to start on a style that's hard for you to maintain over time. Use one that you enjoy and find easy to draw.  That doesn't mean that it must look simple, just that it's simple enough that you can put in the hours it takes to draw it through a whole story or a series of stories. Explore different styles. Once you see what others do, you can see what you like and don't like. That will help you figure out what you like in your own style. Try not to just copy any one style exactly. You want yours to be unique in some aspect. Working scene by scene, create your manga. Begin by sketching out the scenes, blocking where the dialogue and characters will go; remember, you're just creating a bare-bones sketch to see where things will go. Move on to fully drawing out the scenes, but use pencil so that you can make changes. Later, fill in with ink and color. Many mangas are not colored, due to cost restrictions, so you can work just in black and white if you prefer. In fact, many publishers prefer black and white. How you create your manga is up to you, as many manga artists work in digital formats nowadays.  If you prefer to work digitally, consider using a manga drawing app. These tools are designed for creating comics, so they will make it easier for you to work.  Don't forget to make your text legible. If people can't read your text, they won't read your comic.
Brainstorm ideas for plot. Plot out a story. Make your characters. Develop a style. Create your manga.