Read the book on which you wish to base your review. Visit your local library to borrow the book for free or read a free online downloadable version of the book.
Write down pencil notes in a notebook during and after the read to record your observations of the book -- about themes, characters and what you liked and disliked about the book.
Research the author of the book -- via the book introduction, autobiographies, journals, study guides or the Internet -- so that you can incorporate facts into your review pertaining to the reason why the author wrote the book; and also to help back up your opinion on the relevant points you make in your review.
Mention the title of the book as well as the author's name at the start of your review so the reader knows instantly what book you are about to discuss. Include other information to help the reader find the book easily if she wishes to read it -- such as the name of the publisher, the date it was published, the price and the ISBN number.
Introduce the genre -- such as comedy, thriller, murder mystery, romantic, period, horror, science-fiction or drama. Write a brief summary of the main storyline to set the scene and to give the reader a brief idea about what the book is about. Do not reveal the end, as a review is only meant to give readers one person's perception of the book and the quality of the writing and storytelling. Be careful not to reveal the whole story because the reader of the review will feel cheated if they want to read the book.
Structure your book review by writing a paragraph for each point or observation you make about the book.
Tell the reader what you feel about the book. Give specific reasons why you enjoyed or disliked the book and make sure to justify your slant on the book with references from the text.
Discuss the themes of the book. Indicate your thoughts on how the author handled her subject matter. Note down the perspective of the book and talk about how engaging you found the characters.
Discuss the relevance of the story within the modern day context to make it a more enticing read to the modern reader, particularly if the book is a classic.
Visit your local bookshop and ask the store manager if they would be interested in putting your book review on to a loose paper sleeve to help publicize the book in question. Publish your book review online on your own website or via another website interested in publishing free book reviews.