I'm doing research on how to create a book trailer. The easy thing to
do would be take a class.  I couldn't seem to find one offered at the
right time for me, so now I'm on my own.

Here  is what I've taken learned so far about the 4 elements in a book trailer:
1. IMAGES: Use images that are at least 640 x 480 pixels. In other
words, do not try to stretch a small picture until it becomes a blurry
mess.  I'm dealing with the frustration of looking at
billions...no...zillions of images and becoming overwhelmed while not
seeing that "just right" picture.
2. VOICE: Write a script/blurb. Your voice should be represented with
these carefully chosen words. Also, you need to be short and sweet. A
few words go a long way.  I am a master at handing out the advice on
other writer's trailers.  Although I've never made one, I seem to
think I know just what will help someone fine-tune theirs. If I've
offered comment on yours in the past, be assured that your time is
coming soon. Please be kind.
3. MUSIC: YouTube actually has music that you can add to your video
with a service from AudoSwap.com.  I listened to several songs, and I
think I'll be able to find something. I read an email post from one
author in my online group that  said it's acceptable to use any music
as long as it is not from Warner Brothers. I wish I could locate that
post. 
4. PACING: I might try for 10 sentences + 10 pictures = 30 seconds in
book trailer length. At maximum, I think a book trailer can be 2
minutes long. It needs to be really interesting to keep my attention
for that length. We'll see.

Wish me luck! I'm looking at using Windows Movie Maker since I already
know how to use it or maybe Animoto.  If you have any tips for me, I'd
love to hear them.