How exactly do you make your illustrations?
My process usually consists of drawing traditionally on Bristol or Vellum board with ink and brush or nib. I then scan the drawing and tweak/color it digitally on my computer.

Where did you get your brush pens, calligraphy pens, inks, etc?
Read this & this for a full run-down of all the tools I use. 

What program do you use to edit your illustrations/photos?
I use Photoshop CS5.

What pen tablet do you use?
I’ve been using a Wacom Bamboo Fun tablet, and I recently switched to a Wacom Bamboo Pen & Touch.