I believe the best thing to start an absolute beginner on are the root fundamentals: Developing the bridge, stance, and stroke.
Not sure if anyone else does it this way, but I think this is a good way to help a beginner develop their fundamentals...
Randomly roll all 15 balls out on the table (no clusters) and have them shoot each ball into a pocket, any pocket, without using the cb. They should try to send each ball into the center of the pocket, working on visualizing the path of the ball, getting the body aligned in accordance with that path, building a solid and comfortable stance, a solid bridge, a slow take away and a smooth stroke delivery with a purposeful follow-through on each shot.
The primary goal is to be able to send all 15 balls into the pockets as accurately as possible, striking slightly above center on each ball at medium speed, so the ball starts off rolling, not sliding.
Bring the cb into the mix after the player is able to do this consistently and accurately every time.
I used this method with a couple of beginners and they really enjoyed the process. I believe it was because their improvement/progress was so easily noticeable, and that made them want to keep at it until they pocketed all 15 balls without any misses. Then I'd say, "That was pretty good, now lets do it again, this time really paying attention to sending each ball perfectly into the center of the pocket."