Encyclopedia Britannica is a great place to begin any new project. Be sure to click on the periodical and web links related to your search.
History Reference Center has a lot of great biographical information for important historical people.
Middle Search Plus is a wonderful database ... try it!
Gale eBooks there are many biographies here as well.
EasyBib will help you generate your citations (for a Works Cited or Bibliography page) perfectly, in MLA format. Give it a try!