Know the requirements of your assignment. Ask questions until you understand it completely. Can you read any book? Must it be a specific length? A specific genre or subject? Should you simply summarize the book or should you give your opinion, too?
Figure out what your teacher is looking for in a book report. How many words should it be? When is the deadline?
If you have not yet chosen a book, ask friends if they have any good suggestions. It's a good idea to check a very quick summary online to make sure it's your type of book. Be sure to stick to any lists or limits you have been given.
Read the book and annotate. Keep a pencil and paper by you as you read, writing down points and page numbers. Take notes, mark important parts, underline enthralling lines (if you are allowed). Try to appreciate the book: It will teach you something if you are open to learning. Keep these things in mind:
Characters: Who are the main characters? What happens to them? Did you like them? Were there good and bad characters? Did they all have good traits and bad traits? Did they seem like real life people or animals, or did they seem fake?
Main ideas and themes: What is the main idea of the book? What happens? What did you learn that you did not know before?
Quotes: What parts did you like best? Are there parts that you could quote to make your report more enjoyable? 
Outline the main ideas and sub-ideas of your book. Do this while the story is still fresh in your head. It will help you organize your thoughts for your report.
Who were the main characters? Why did they do what they did? How did they change throughout the book, if at all? What made you like or dislike them as you read?
What were the turning points in the story? What big, important events happened in the story? How did the resolution of the story come about? Was it a satisfying ending?
Start with a clear introduction. In the first paragraph, state the title and author of the book. Your teacher may want the publisher, year of publication, genre, and the number of pages, too.
In addition to the basic facts, you should give a short summary of what your book report explores. Touch on very basic plot points of the book and the themes the author used.
Create the body of your paper. For the next few paragraphs, refer to your teacher's assignment sheet to decide which parts of your outline you want to expand on in the meat of your report.
Consider giving your opinion of the book. Was it good? What about the book made it good or bad, powerful or dull? How does this work compare with others by the same author or other books in the same genre? You can and should use examples from the book to back up your claims.
Dig a little deeper. What major themes, motifs, or terms does the book introduce, and how effective are they? Did the book appeal to you on an emotional or logical way? Would you recommend this book to others? Why? What would you tell them before they read it? What would you talk about after you read it? 
Don't try to summarize each chapter or every angle. Choose the ones that are most significant and interesting to you. 
For non-fiction, provide a general overview of the author's topic, main points, and argument. What is the thesis? What are the important conclusions? What are the author's qualifications to write about the subject? Do you agree with the author's arguments and conclusions? What is your overall response to the book? Did you find it interesting, moving, dull? 
Write a conclusion that wraps everything up. Restate your thesis or main idea in your conclusion. Review the major points and, if appropriate, state your opinion.
Pull all your thoughts together. Leave the reader with the impression you were left with and, if the book was good, make them want to read the book for themselves.
The format should be included in your assignment sheet. In general, however, most essays and reports should have an opening paragraph, about three body paragraphs, and a closing paragraph. The margins are typically 1 inch, and the spacing is almost always double. Some teachers will want 12pt font, while others will accept 10pt font.
A one-paragraph book report would include the book's title, the author, and a brief description of the plot. You'd also want to say whether or not you liked the book, and why.
Use a thesaurus to increase your vocabulary. Just make sure if you don't know a word that you look it up in the dictionary before using it.
First, talk about the author. Then start talking about the book. After explaining its contents, give a final opinion about the book, including what you liked and what you didn't.
Review the rubric and see what you have to do. Try envisioning what you want it to look like before you start so you have an outline. First, start one chunk at a time. Divide chunks up into deadlines so you can stay on track. Aim to finish 3-4 days before the book report is due so you don't have to do it the night before!
The setting is the time, date, and location in which a story takes place.