Where can you get information on the plague?

Try an online encyclopedia, Wikipedia.org is often a good start, their information is not 100% reliable though, maybe buy a book or go to the library.

If you search "The plague" in a search engine, like www.google.com for example, you may get the results you need.

You could use this site, which may already have some questions already answered about the plague, if not you could always ask what you need to know in a new question.