Once you have a connection to your computer you can just drag and drop them to the /kindle folder on your internal storage. Unlike my Kindle, however, it will not read books within folders (within the Kindle folder).
So put your books here: /kindle
Not here: /kindle/book name/
As far as connecting to your computer to transfer the files you can use the USB cable that came with it or you can create a wifi connection - though the former is probably easier.