For quick advise, look at the reference below for Wikipedia for some ideas. Always reword what you read and research in your own words. If your teacher will allow for it, you could possibly copy some of the pictures for your essay – just put a note at the end to indicate where you found them.

You could also look at any large museum on the Internet – say the Smithsonian in Washington DC to see what they have at their location.

See the links for starters

Also, do a Google search on the various terms you are learning.

About the subject, just do some more research on it.
[It's also best to not procrastinate on x-page reports so you're not panicking and rushing to get work done.]