Hi Priscella and welcome to MobileRead. I have a Sony 505 and really like it. We have a section devoted to helping people make up their minds on what to buy here
https://www.mobileread.com/forums/forumdisplay.php?f=123 Post your questions here and you'll get quick answers.
Meanwhile, I have a Sony 505. You can buy books from Sony or several other sites. And you can borrow books from various libraries. You download the book to your computer then move it over to the reader. I like it fine. But see what others have to say about the Kindle.