In answer to question 1 about your existing books, if they were bought from the Sony Store then yes they will have DRM which will need stripping out before they can be converted to mobi format for the Kindle.
If they don't have DRM (i.e were bought from somewhere else, or obtaining freely off the internet) then you can convert them to mobi format using Calibre, and the mobi format can then be loaded on the Kindle.
I am a Sony owner and this is what I have done.
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