I wrote about the horrors of pre-invasion Iraq on my personal weblog. I talked to victims of Saddam's anti-Kurdish holocaust and saw pictures of gassed Kurds.
http://web.mac.com/ajbrehm/Home/Blog/Entries/2008/10/9_Erbil.html
It was especially difficult for me since I am from Germany and the poison gas Saddam used to kill Kurds apparently was from Germany too. I cried when I saw the pictures. I didn't publish all the pictures I took.
And I wrote here on JoeUser about the elections in Iraq last month and how Iraqis voted for the most pro-American candidate, the man who told the west about the WMDs:
http://citizenleauki.joeuser.com/article/378485/2010_Elections_in_Iraq
The Iraq war might be one of the most well-documented wars in history, so I'm not sure what you want to do to make people more "aware". But if you like I can give you lots of information about the horrors of Saddam's Iraq and how much things have improved since 2003.
If you want "someone important" I recommend the letter written by the first elected president of Iraq, Mr Jalal Talabani.
http://www.thesun.co.uk/sol/homepage/news/article106466.ece
In it he thanks coalition forces for the sacrifices and for liberating his country.
So if you want to surprise your teacher, give him lots of information that cannot easily be found by watching television in the evening. You may use my pictures of Saddam's secret police headquarters if you like. Be sure to include a picture of the Russian tanks.
As for whether the invasion was necessary, I think it was.
But then I grew up in Germany ONLY because the same sort of thing happened to my parents.