Yeah, it's a card stock type of thing. Same thing that =
Nestly linked to in her post. It'd probably be most professional to apply that protective coating stuff. But really I just take a good scan of it and then put it into a card sleeve. It works fine enough.
As for pens and such, I use PrismaColor art markers for these ATC cards. They do a nice job in my opinion, but they can be rather expensive. Any medium will work fine for these, though!