Here is a very interesting book that tells you how to create great videos. Originally, it was written for teachers but it might help you if you have not finished your storyboards or worked out your ideas completely.
I also recommend this website about creating videos!
Finally, if you haven’t got an idea yet, check out PowToon. You can create videos like this (be patient, loading might take a while):
Enjoy and steal all the great ideas!
By the way: Which sources have you found? Tell me all about it and write a comment!