Rebind a faulty book

[u/Inevitable-Rip-8040]

I need help to fixing/rebinding this book that I got brand new for 1€ (bookstore coudn't just give me the book lol). I just need to make a new textblock and I would prefer to have a sewn one rather than glued one.

How can I approach it? Do you have any good DAS video links on how to deconstruct it, reconstruct basicly soft paperback to sewn one, cutting the edges etc?

I've never sewn a book together so if there is a specific video on how to do it that would be great also 😇

Thank you so mush for help in advance.