type in "marijuana" into Wikipedia and they'll have a crap-load of information. don't just make it all pro though, that won't go over well. rather, try to make an unbiased report on the pro's and cons of marijuana, sighting different study's on it's effects. For your pro-weed information, you can get pretty much infinite links to information from this site.

*sigh* I still can't believe we live in a world where people are prosecuted for something that doesn't hurt anybody.