A helpful website with lots of information on all nation states: https://www.cia.gov/library/publications/the-world-factbook/
Basic Information on the United Nations: http://www.un.org/english/
A branch of the main web page, UN Security Council page has lots of good information: http://www.un.org/Docs/sc/
Another branch off of the UN main web site, with lots of good information: http://www.un.org/ecosoc/
This is another branch of the main website that pertains to International Law, this website would be helpful to those delegates in the SEcurity Council or GA 6: http://www.un.org/law/
* The one thing for all delegates to remeber is to think about the credibility of your sources. The last date updated is also an other thing to look out for, the more recent your data the better. Happy Hunting!