Begin on the top left hand side of the page. This is where you will type in all caps the page number for the comic, which is then underlined. For example, if you are just starting, your page will be labeled “PAGE ONE” and underlined. Note that this is for the actual comic book page and not the script itself. In some formats the number of panels follows the page number: PAGE ONE (Four Panels)
Type the panel number where the action in that particular panel will take place. For example, if you are still on page one and you are writing for the first panel, your page will look like this:
PAGE ONE (Four Panels) (this would be underlined)
PANEL 1
The number of panels will vary from page to page depending on the writer; however, four to six pages is a good rule of thumb.
Write the action below the panel number. If you are introducing a character for the first time, make sure you use all caps when displaying the character's name. After that, the name can be typed regularly. Be as descriptive as possible (but do not overdo it), since you are essentially setting up the scene for an artist. For example:
PAGE ONE (Four Panels)
PANEL 1
A CHARACTER enters a dark room, with only the light from the doorway peering through from behind him.
A writer can also incorporate terms such as close-ups and wide shots in order to give the artist more direction. If the action requires a sound effect, type the way the sound effect would sound in real life, or as close to it as possible.
Give your character dialogue underneath the action. Center the characters name in all caps, then hit enter and center the words that they are going speak.
PAGE ONE (Four Panels)
PANEL 1
A CHARACTER enters a dark room, with only the light from the doorway peering through from behind him.
CHARACTER
My, it sure is dark in this room.
If the character is speaking but cannot be seen inside the panel, use a parenthetical expression underneath the characters name to indicate they are "OP," or off the panel (similar to off-screen in screenwriting.)
Repeat for each subsequent page and panel of your comic book script.