I found this tutorial to be descriptive and wonderful. A great way to kickstart this section that will compile the best drawing manga tutorials that I can find online. You can subscribe to Nao Yazawa's channel on Youtube.
Aside from the blue pencil method, you can use your mechanical pencil to sketch softly and then define the lines by pressing further as you draw and clean the lines.
Aside from the blue pencil method, you can use your mechanical pencil to sketch softly and then define the lines by pressing further as you draw and clean the lines.