for sketching and fixing all your mistakes before making the final drawing.
for erasing your mistakes.
for drawing the comic panels, or the boxes which one page of comic or manga consists of.
Black ink liners
you probably need a collection of black ink liners to use on your final drawing. These pens can have different types of tips with varying thicknesses to achieve varying widths of outlines.
Colors if needed
you can use ink color or alcohol-based markers to color your drawings if you want to end up with a colored illustration.
Tip: some artists choose to scan their drawing then color it digitally by using any photo editing software, which can result in precise colors every time.