First up we have the script. Usually what I do with a script when I get whether its something I've written or work from another writer, is read over the script while making thumbnailed drawings off to the side as I invision the scene happening on the page.
From there I'll start drawing the page. I know it looks like Ive skipped a step and forgot to show the pencils of the page, but I usually do all my detail in the final inks so I dont really mess around to much with very tight pencils unless its something I know that I can do better there than when inking.
After the inks had dried and I've scanned the page into the computer, Im ready to start toning the artwork. I use a really old version of Photoshop that I've had for years to tone my work. Usually what I'll do is place down a layer of one solid grey tone, multiply that layer, and then go in and use the burn tool to add depth to the piece.