The Kindle 2 International now supports .pdf files. Of course you can upload them via USB. I've never had problems with that so far. Just remember to save them in the right folder ("documents").
The Kindle 3 also supports PDF.
It is generally better to covert the PDF to MOBI format so that you can improve readability by increasing the font size or even have the Kindle read aloud. Check out the link below for how to.
To get books on your kindle or kindle fire, hook it up to the internet and buy the books on-line. Wait for them to download then enjoy.
yes
No
Download the Amazon Kindle app from Google Play, then login with the account you used on your kindle fire. The books should be located in "Archived".
Yes it is but there is a kindle just for reading books but the tablet can do more than books.
Yes, you can listen to audio books on the Kindle and listen to music on it.
It means that you import all the books you have on your old kindle.
no.
yes
The Kindle Fire is WAY better if all you want to do is read books.
don't
Yes especially on the Kindle Fire. I recommend the fire. You can quickly and convienetly go through all the books you like. Its easy to use and completely affordable.