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#1: You should probably watch carefully not to discharge the battery completely. Put it on a charger and try to switch it completely off by long-holding the power key. Since it is off now - as it seems, maybe the battery is already discharged - leave it like this for now.
#2: The link you sent is for a Kindle Touch, not a Kindle Paperwhite. The Kindle Touch also has USB downloader mode available which allows fixing, while the KPW doesn't.
You need:
- soldering skills for accessing the serial port connectors on the PCB and solder some wires to them. Thin, very, very thin wires.
- a 1.8volts (!!!) UART, which you can use via a terminal program. Many possibilities here, but yes, in the link you've sent, the author uses a USB-UART adapter for this.
Connect the UART adapter to the soldered cables, et voila: access to uboot, and maybe a boot prompt (I doubt it, since it is constantly rebooting).
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