Pen and Ink Class Basic Materials
  Below are papers and pens that I have in my studio, there are MANY more fine products available. 
I suggest that you rummage through your drawers; you may already have the perfect pen!  Copier paper will work fine to get you started however, I am leaving notes below with a bit more info on paper.   
Not all pens are created equal!  You want to look for pens with ink that is waterproof or water-resistant.  This type of ink allows you opportunity to add a wash of color to a drawing to your artwork if you desire.

I recommend starting on a venture into pen and ink drawing with choosing disposable pens.  These are available in a variety of nib sizes and you will get excellent results without a BIG investment of money in materials.