Drawing involves the use of lines and clusters of lines called values. Lines and values often merge spontaneously as you draw, one springing from another in the same stroke. The better you understand the range of expression and working qualities of your pencil or pen, the broader your palette of artistic options are when you create.
A line is a flowing stroke of your pencil that defines an edge in the image you are drawing. Value is the gradation of grays you use to define the mass, form, light, and design of your drawing.
I did use the term tone for years for describing black and white drawing. Whoops. When you strip color from the picture, you should also strip the language of color from your jargon. I'll use the term "value" when talking about a gray created by drawing in black in white. I'll even use the term "shading" to describe making the right values to bring out forms and shapes because it also means "relative darkness" and "cast shadow."
Recommended brands: Dawler-Rowney, Dr. PH. Martin, Higgins, Pelican, Speedball-Hunt, Rotring, Koh-I-Noor, Winsor & Newton, Montblanc, Watterman, Bic, Papermate, Pilot, Pentel