Here are some pictures to help you understand how the Kindle works.
This picture shows the little light at the bottom while the Kindle is being recharged. The light turns green when its fully charged and Yellow while it is being charged and is not fully charged.

Kindle portable ebook reader compared with a Paperback Book
One of the things that used to worry me before I bought my Kindle ebooks reader, was “Is the screen roughy the same size as a paperback book page?” The reason this used to bother me was I had no way of finding out (You can’t just go in to Best Buy and check out the Amazon Kindle’s like you can an HDTV) and I thought, If the screen is a lot smaller than a paperback page, I wouldn’t like it because then you’d be turning the page ever 5 seconds and it just wouldn’t be “the same” as reading a book.
Get a Kindle Wireless Reading Device (6″ Display, Global Wireless, Latest Generation)
I really wanted the larger size Kindle, but decided on the smaller size because I could afford it. The result? I’m glad I got the smaller size. The screen is for all intents and purposes the same size as a paperback book page and reading it feels just like reading a book. Here are a few pictures that show you what I mean by comparing the screen to a paperback.

Amazon Kindle Electronic Book Reader Compared With A Paperback Book

Kindle - ebook device - how to change the fontsize