Connect Mouse and Key-Board via USB and HDMI to a Monitor.
Enable SSH Server
Extent Flash Card usage
Optional PI User Password change

Choose from "Internationalisation Options >> Change Keyboard Layout" Classmate PC as Keyboard and 
then "Other" to get a German Layout to select.
Select German without any additionals.
For the primary and langaue-Specific Keys choose "default" 
No - compose Key
No - for "STRG + ALT + Del" to exit the X-Server

Set up WLAN via GUI to check if hardware is running fine
Set: export EDITOR=vi in /etc/profile

apt-get update
apt-get upgrade

Install Telnet, dnswalk, dnsutils, zip and iw:

apt-get install telnet dnswalk dnsutils zip iw 

Extend syslog config to enable Chilli write a dedicated logfile based on „Chilli Log Prefix“ for all new connections

Create a file under /etc/rsyslog.d/ChillyNCon.conf containing

:msg,contains,"[ChillyNCon]" /var/log/ChillyNCon.log

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Additional:
Change Default language via commandline:
sudo dpkg-reconfigure locales