http://intranet.dalton.org/groups/greece/ GREAT RESOURCE! – tons of links geared to your age!!
http://www.bbc.co.uk/schools/ancientgreece/main_menu.shtml FUN interactive page, has some useful information.
http://www.ancientgreece.com/ provides lots of links, but some are outdated.
http://witcombe.sbc.edu/ARTHgreece.html Once you get to the site, scroll down to get to the links.
http://www.perseus.tufts.edu/ Challenging website that is used by many colleges and universities. Can be difficult to navigate.