I'll chime in with both the other posters and agree that you should get a Kindle. My personal preference would be for the Kindle Touch with ads $99.00 from Amazon. You could also get the refurbished Kindle Touch for $79.00. If you are just going to be reading ebooks then you can't go wrong with a Kindle. I absolutely love mine! The text is crisp, clear and adjustable, also you can read outdoors in the sunlight without glare (unlike the Nook Color, Kindle Fire or an android tablet).
As for learning how to use a Kindle... just follow the link below, click on Kindle Help, Video Tutorials and Tools. There's a wealth of information there on using a Kindle.
http://www.amazon.com/gp/help/customer/display.html
Hope this helps!
____________________
No trees were harmed in the sending of this message;
however, a large number of electrons were terribly inconvenienced.