As I do agree with the others in that selling babies shouldn't be priority number one, I am amazed at what you are doing for your son. I have a 5 year old niece who absolutely loves my snakes and am thrilled about that. To have your son thinking about breeding at 8 is insane. . . but a great kind of insane! I do think his main focus should be in husbandry, first, selling later-- if ever.
I have never bred a snake, but as a buyer of some pretty expensive animals, I have to say that what I want to see in a breeder is commitment to the animals. That is what will make me buy a snake. When I ask questions about a specific animal, I need specific answers. I really appreciate information about the snake I want to buy, not hype about what it looks like.
So, in a nutshell, I would reccomend you and your son breed the animals, and know and really care for the babies. Know which ones eat and which don't. Take care of the babies first and foremost. Have answers to every question ready about the parents. Foster a love for the snakes in your son and your problem won't be selling them, it will be keeping them. Just my opinion.