After buying a book number, could he find a printing house to print the book and sell it himself?

After buying the book number, he could contact the printing company to print the book according to the book number and sell it himself. However, it should be noted that different book numbers have different requirements for the printing factory. It is necessary to understand the relevant regulations of the book number in advance and ensure that the printing factory can print according to the requirements. In addition, he also needed to consider printing costs, sales strategies, and other issues to ensure that the book was profitable.