A:AnswerYes it is back lit and looks very nice. Has a feature for reading in bed and dims itself. Also you can set the auto off which is adjustable. Really a nice tablet.
A:AnswerYes, you have to install the Play Store. Google it for instructions on how to do this with the Fire tablet. You will then be able to install Instagram and also MightyText which allows you to text from your tablet.
A:AnswerYour best option would be to type in the exact model/screen size kindle you have when searching for a case. They're not that expensive and is must for clumsy hands and small children!
A:AnswerThe biggest difference that I can see is in the OS. Now you can easily load Google's Play store and use it to download almost any Android app.
It makes a big difference to me in just how usable the tablet is.