Bizarro-
Welcome to MobileRead!
For plenty of free ebooks, check out the MobileRead collection at
https://www.mobileread.com/forums/ebo...&sort=dateline
(There is a convenient link just below the MobileRead logo on the top of the website.)
Any book listed as ePub or Sony BBeB (lrf) formats will work great with your reader. (PDF will also work.)
You may also be interested in checking out Calibre for ebook management. (Think a more powerful iTunes for ebooks.)
http://calibre-ebook.com/ They also have a dedicated forum on MR.
Good luck, and enjoy your reader!
Ricardo