A few of the things I use (links and images forthcoming):

Index cards (3×5 and 4×6):

Easy to throw away embarrassing mistakes. 4×6 cards fit in my printer and let me make drawing templates that I get easily bored with.

Manga Studio EX:

An incredibly useful graphics app for making comics. Also: incredibly inexpensive.

Moleskine sketchbooks:

For when I want to feel that I’m drawing important things.

Staedtler Mars Graphic 3000 Duo:

In my opinion, the best brush pen overall, the tip does not lose its shape. Not my favorite version of black, but I can fix that in post.