I think #2 makes a number of valid points in terms of how to approach the various stages of structuring your essay. To me, one of the most important points is brainstorming your knowledge of the topic to establish the most important points and then narrowing them down to pick about 3 or 4. Then you can focus on those points and work out what you want to say about them, coming up with an essay plan. Good luck!
While I have not read the book nor do I know American Sign Language, the answer to your question is that the process for writing an essay is the same whether the requirement is five paragraphs or five pages. Don't let the length scare you. First, decide the important points you want to make about the book. Each of those points will become several paragraphs of discussion keeping in mind the main controlling thesis and the sub topics you have chosen to prove or develop that thesis statement. Length is achieved by thoughtful discussion or analysis, relevant quotes from the book which back up or prove your analysis, and then other points which fit such as why this book is important or relevant to people's lives whether they belong to the deaf community or not. Does the book deal with deafness as a handicap to be overcome, or does it discuss the way society approaches being different in this society? What is the significance of the title because the use of the word again is rather surprising. Think about who else should read this book and why? In other words, plan out your important points which prove your thesis using the book as your resource.