I don't really know who Shelby Day is in this context as I haven't read the book. But I assume Shelby Day is the author of the novel who has created this story about the lost girl.
Tommy in the 'tommy good story' could be anyone. He might be a child with a vivid imagination and a heart full of goodness. Or he could be an adult who has had some remarkable experiences. Maybe he's a local hero in the context of the story, someone who is known for his positive actions.
Some cable TV channels that focus on automotive or documentary programming might air 'Shelby American: The Carroll Shelby Story'. Check your local listings. Also, some specialized online documentary websites could have it available for viewing.
I don't have enough information to say who they are exactly. They could be ordinary people with an extraordinary story, or they could be well - known in a specific community or area.
The character of Thomas Shelby from 'Peaky Blinders' is fictional. However, the show is set in a real historical context, with elements like the post - World War I Birmingham, the gang culture, and the social and political climate of the time being based on real historical research. But Thomas Shelby himself is a creation for the purposes of the TV series.
Shelby and Rachel's relationship in Glee fanfiction can be really complex. In some fanfictions, Shelby might be seen as a mentor figure to Rachel, guiding her in her musical journey. This could involve Shelby sharing her own experiences in the music industry and helping Rachel avoid common pitfalls.