"Brian's Brilliant Career" by Pamela Rushby is podcast by Rachael and Sela from Room 18.
This book is about a boy who gets talent scouted when a TV News crew visits his school. He joins a talent agency and he does some work on commercials. During the course of the podcast you will hear about some of the incidents that happened when Brian started making advertisements.
Both these girls have experience presenting on Pt England's own television news show, PENN, and they conclude that presenting is a better option than acting in commercials after reading this book.