Thanks for the answer
(Just to complete the thread so that others can also profit from it: )
I've asked for further advice in the IRC channel because I didn't find much stuff related to Kindle Paperwhite, but they told me, that this link (
https://wiki.mobileread.com/wiki/Kindle_Touch_Hacking) is working for the Kindle Paperwhite.
PS: To 2) could you tell me the name of these then?