adapted from a VOYA article by Pamela Lowell-Five Easy Steps to Making a Great Book Trailer that your Students-and Even Technophobes (like me)-Can Master & How to Make Book Trailers Slideshare by Jenny Butler
Watch some of the booktrailers on this site. Analyze their content. How effective are they? What are their strengths and weaknesses? Which books do you want to read? You will notice that some of these are professionally produced while others are fan-made or student-made.
Search book trailers on YouTube
Some good concepts here but....well, see what you think.