Welcome momonique.
I think you need to decide what you want it for. If mainly reading, then most people find eInk to be preferable. It's more like reading from paper and the devices don't have the capability of adding apps and other distractions. You would still be able to adjust the print size and type (somewhat) and look up words in the dictionary, etc. Assuming you have fairly ready access to a wifi network, there's no real need for 3G, so the cheapest kindle from Amazon $69 would do you just fine.
That one comes with brief advertizements on the lock screen. Sometimes you'll get good offers but mostly their just ads. Still they're 'only' ads. Nothing objectionable and nothing will pop up while you're reading or anything like that.
IF you want a reader but it needs to be able to double as a tablet computer, you need to be looking at one of the Fire models. They will be significantly more expensive. They're also, arguably, not as good if you just want a reader because you can have apps and other distractions. That said, if you need to be able to go to the internet, say for school or something, it would serve you much better. Except for the most expensive version, they will be WiFi only.
Go to any Kindle page on Amazon (follow the links above) and you'll see a full comparison of the prices of all their models, both eInk and backlit HD.
EInk devices start at $69; the most expensive is $199 -- That's the touch screen Kindle "Paperwhite" without ads and with free 3G (for book downloads and wikipedia only; no general web access except on WiFi). They're readers only, though with more or less features depending on your preferences: physical keyboard or no, touch screen or no, ads or no, 3G access or WiFi only.
The Fires
start at $159 -- that's the most basic model: minimal memory, standard screen -- and go up to $499 -- that's the larger HD screen model with 4G capability and 64GB memory. Note that the 4G access is an additional $50 for the first year. Basically they're android based tablets but with Amazon flavoring.
