Well, for drawing manga full body, you need to have a good understanding of anatomy. Start from the head and work your way down. Remember to use simple lines at first and then refine them. Also, observe references to get the poses and proportions right.
To draw a manga full body, begin with a rough sketch of the pose you want. Next, focus on the facial features and hairstyle. Add clothing and accessories last, making sure they fit the character's style and personality.