So you wanna make a lineart? Well here's a tutorial that might help!
First of, you need a refrence pic, or the picture you going to draw. But make sure you credit the original artist who made it.
Make a basic sketch of the pose.
The next part will be more detailed, so put it on another layer and lighten the basic sketch
Here's how i made the hair. Make sure you have your ref right next to the canvas.
The third layer is even more detailed than the last. Remember, it doesn't have to be perfect, it's only a sketch.
Time for inking! When mangakas (manga artists) draw, they use a pen and nib. To get that effect, darken over some areas like the ones circled.
This is what the final product looks like! Hope you learned something.