Welcome to MR, dawnah
I have had the 505 for a year now and love it! Have you seen all the free ebooks on this site? You can use the lrf and ePub versions for download.
Also, feedbooks has free ebooks and many of our MR authors put their work up there. Check my signature for the list of some of the authors to look for. The sig link takes you to the page of my list of authors there.
Smashwords also has free and for purchase ebooks. Some of our MR authors are there also.
Have fun with your new toy and jump in to ask questions if you need to.