Customer personalization option

[LibbyCat50]

Hi, I sell books online and would like to add an option to some of my products for customers to select YES / NO to having their book signed. If yes, then a text field for the customer to enter a personal inscription would be needed also. Can you help with how to do this please?
Thanks a lot!

[LibbyCat50]

Thanks for this advice. I'll give it a go.