Here’s my pencil rough for Page Three of the current issue.  I draw these out in pencil first,  then scan them in at 300 DPI and ink them digitally in Photoshop.  The page is then lettered digitally in Illustrator.  I work from a loose script which states basically what is supposed to happen on each page (although it tends to change over the course of the issue),  but all dialog is written at the drafting table.

Here’s my complete working script for Yucateca:

A famous archaeologist,  Frances Lenard,  comes aboard to travel to the Yucatan to explore a rumored new ruin.  Upon arriving in the general vicinity of the ruin,  they happen upon Gregor Lokennor,  a man stranded in the jungle,  claiming to be a missionary.  When questioned about the logic of doing missionary work in a deserted jungle,  he is evasive and insists that he has simply lost his way.  Blanchard experiences a flare-up.  The crew tracks down what seems to be part of a deserted temple and Frances Lenard sets to work with her investigations,  Aaron volunteering as an assistant while simultaneously nursing his father to the best of his abilities.  His desire for adventure and his reluctant devotion to his father causes stress.  Meanwhile Gregor is spending a lot of time examining the canopy with a telescope and poring over charts,  but refusing to to explain his motives.  Robinson catches him in the act of attempting to rob one of the ship’s (empty) ammunition depots.  Growing suspicious,  Robinson pressures him into giving a sermon,  which he botches absolutely.  Sensing the crew’s growing distrust,  Gregor seeks out Aaron alone and reveals to him his true intent:  he is not a missionary at all,  but rather a private treasure-seeker who desires to find immense amounts of Maya gold which he imagines to exist in the area.  Unable to resist this siren call of adventure,  Aaron readily agrees to accompany him,  abandoning the ship by night and providing Gregor with a weapon (personally owned).  They parachute-jump into the canopy,   but the drop was too short and the parachutes are not really effective.  Both are somewhat injured by the incident.  On the ship,  Blanchard grows worse,  and there is no one on board with the knowledge of how to care for him.  Desperate,  the crew begins a search for Aaron,  who has been having adventures of his own with Gregor,  who is obviously extremely unethical and untrustworthy,  and is clearly using Aaron to his own ends.  Finally they are able to track him down with Frances Lenard’s help,  leading to an uncomfortable climax:  Raven and Frances Lenard confront Aaron,  telling him that his father is dying and he has to return to the ship.  Gregor threatens to shoot him if he attempts to leave.  Aaron strikes him across the chin and they escape,  abandoning Gregor to the jungle.  Later,  Blanchard is feeling better with his son’s aid,  and Frances Lenard tells Aaron that her research has clearly shown that the area possesses no treasures.  She gives him a small Maya dagger from their excavations,  though,  and encourages him to consider a career in legitimate archaeology.
1. Raven is cooking breakfast for everyone (terrible as usual).  Blanchard is walking with a cane again.  Aaron talks excitedly about the mission and the (presumed male) archaeologist.
2. Frances arrives on board.
3. Title.  Plans to explore the jungle commence.
4. Aaron and Frances begin exploring the jungle.
5. Aaron wanders off by himself a little and happens upon Gregor.
6. Gregor is brought back to the ship and the crew attempt to glean information about him.
7. Gregor tries to help Frances but appears careless.   Frances orders him off the site.
8. Gregor begins to spend a lot of time using a telescope.  Robinson requests that Aaron try to spend a little more time on board the ship.
9. Gregor again tries to gain access to the archaeological sites.  Robinson orders him to stay on board the ship.
10. Up late one night,  Robinson discovers Gregor trying to break into the ammunition depot.  Growing suspicious,  he goads him into giving a sermon.
11. Gregor attempts his sermon.
12. Gregor pulls Aaron aside for a little talk.
13. Blanchard isn’t looking good.  Aaron wants to help Frances,  but he needs to stay in the engine room and run an adjustment procedure.
14. Aaron and Gregor join forces.
15. Aaron and Gregor crash-land in the jungle.
16. Robinson is searching for Aaron when he discovers the unconscious Blanchard.
17. Robinson and Frances attempt to help Robinson without success.   Aaron and Gregor are confirmed missing.  Ship cannot be started because Aaron shut down and disassembled the engines during the checkup.
18. A meeting is called to discuss the predicament.  Only Aaron and Blanchard understand the Akhenaten-class.  Blanchard is dying and needs medical attention,  which he can only get if they can find Aaron to fix the ship.  Frances volunteers to head the search,  since she knows the jungle and Aaron.  Raven accompanies her.
19. Aaron and Gregor in the jungle.
20. The away team progresses toward Aaron
21. Climax–The away team finds Aaron and tells him that he’s needed back on the ship.  Gregor threatens to shoot him if he attempts to leave.  Aaron punches him and runs.
22. Return to the ship.  Aaron administers medicines to Blanchard,  who becomes visibly better.  Aaron goes to bed.
23.  Robinson sits Aaron down for a chat,  intending to severely chastise him,  but Aaron instead reveals his intention to resign.  Robinson sees that he is making the correct decision and congratulates him.
24. Aaron,  in civilian clothes,  meets Frances at the dig site.  She explains the truth about Gregor’s delusion.  Aaron asks her if he could join her on her expeditions (possibly not shown?).
25.  Back in the US,  the mission is finally over.  Aaron and H. Blanchard part,  Aaron and Frances leaving together.

First,  as you can see here,  I write a synopsis of the story as a fat block of text.  Then I break it down page-by-page.  As you can also see,  after a point I stop revising the original block-of-text version.  This one has my original ending,  in which Aaron does not leave,  and Gregor’s original meaningless surname,  Lokennor.  Another fun fact:  Frances Lenard was originally going to be a male character.

So these should give you some idea of my process.