If you are interested in becoming a book reviewer for Publishers Weekly, you can start by reaching out to the publication directly through their website or by contacting their editorial team. You can inquire about their submission process for book reviews and express your interest in becoming a reviewer for them. It may also be helpful to provide some information about your background, experience, and any relevant writing samples you have. Keep in mind that Publishers Weekly may have specific guidelines and requirements for their reviewers, so make sure to familiarize yourself with their expectations before reaching out. Good luck!