Research a list of book review journals that you want to submit the galley to. Some of the largest review journals include: "Publisher's Weekly," "Library Journal," "American Library Association" and "The New York Times Book Review."
Read the submission guidelines of the book review journals you plan on submitting to. Most journals have similar guidelines. They generally want galleys three to four months prior to publication.
Prepare the galley according to the journal's guidelines. The cover page of the galley should include, at the minimum, the following information: Title, author, price, publisher/imprint, format, number of pages and ISBN number.
Write a separate cover letter that includes: a description of the book, a brief biography of the author and any pertinent publicity information.
Mail one copy (or two, if requested) of the bound galley and cover letter to the address listed on the journal's submission site.