Once you have a Kindle (or other e-book reader), where can you go to source FREE e-books legally, other than buying them through Amazon or your e-book store affiliated to the reader purchased…
http://www.gutenberg.org/wiki/Main_Page Project Gutenberg is probably the largest collection of FREE out-of-copyright (US) Electronic books in the world, with more than 300,000 books. Check out their WIKI for more info HERE.
There is also an Australian site, specifically for out-of-copyright books in Australia – as Copyright holdings tend to vary by country: Australian Project Gutenberg: LINK
Other links you might like to check out for free ebooks are: