Be sure that you send the complete and absolutely final version of your book for formatting. (indiesunlimited.com)
Main piece of advice: be triple sure that you're submitting the very final version of your book. (thebookdesigner.com)
Publishers plan for this by creating galleys (online or printed final versions of a book, usually in black - and - white), which they can send along with a pitch letter to their editor contacts at media outlets. (cooksplusbooks.com)