You will need to know where on your computer the ebooks are located - for example my Kindle books are located in a folder called "My Kindle Content" - and what format they are in - your Kindle books will most likely be mobi but the Kobo needs ePubs - the Sony books should be ePubs already.
ADE can be used for your ePubs. On the top left corner there is a library tab and the drop down list includeds "Add item to your library" - use this to navigate to the ebook and then add it to your ADE library if it is not there already. Then connect your Kobo (it will need to be authorised) and drag the books onto the Kobo when it appears on the left hand side.
Calibre has an "Add Books" button on the top left side. Again navigate to your books and add them to your Calibre library. If your Kindle books have DRM you can utilise various Calibre plug ins to remove that (not allowed to be discussed here so use Google for that information) and then you can convert them to ePubs using the "Convert Books" tab. Finally when you plug your Kobo in another option will appear "Send to Device" which will do exactly that.
A third option is to connect your Kobo and use Windows Explorer to add the books as if your Kobo was a USB memory stick but this will only work for ePubs without another company's DRM.
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