Q: Where I can find a free footage to make my presentation in class more engaging? My students are copiyng images from Internet for their projects. How to make sure that they are copyright free?

A: In a situation when students are assigned to use the pictures for power point presentation project I will advise students to search in public domains.

How to use Creative Commons to find free images, audio and video tutorial: http://www.youtube.com/watch?v=YvsbJaJeFGY
The instructions are at Creative Commons wiki page: http://wiki.creativecommons.org/Public_domain
and here: http://wiki.creativecommons.org/Frequently_Asked_Questions

Not all the links are working but it is a good place to start your search for free footage.
CC free video search: http://wiki.creativecommons.org/index.php?title=Special:Ask&offset=50&limit=500&q=[[format%3A%3AMovingImage]]&p=mainlabel%3DName%2Fformat%3Dbroadtable&po=%3F%3DName%23%0A%3FMainurl%3DWebsite%0A%3FSize%0A

and films: http://wiki.creativecommons.org/Video

Example: http://wiki.creativecommons.org/Blip.tv
http://blip.tv/

Q: I created video for my class. Where to look for legal music to use in it?

A: Creative commons provides the resources of legal music for videos: http://creativecommons.org/legalmusicforvideos

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Q: How to properly credit the information that I use?

A: here is the link to Citation Machine:

http://www.citationmachine.net/index2.php

Citation machine helps students and professional researchers to properly credit the information that they use. Its primary goal is to make it so easy for student researchers to cite their information sources.