I don't know German, but here is my english attempt at a solution.
1) For the apt-get error: edit your /etc/sources.list making sure the section containing "deb cdrom" is commented-out with a "#".
To edit the file, try:
Code:
sudo nano /etc/apt/sources.list
and add the "#" preceding "deb cdrom"... example:
Code:
#deb cdrom:[Debian GNU/Linux 7.70_Wheezy_-Official amd64 DVD Binary-1]
You may also consider adding "contrib" and "non-free" to the debian URL's in /etc/sources.list since you are editing it.
example:
Code:
deb http://ftp.de.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.de.debian.org/debian/ wheezy main contrib non-free
2) i'll skip this ntfs issue for now.
3) As afore-mentioned, "contrib" and "non-free" is likely required for wireless drivers. Firstly, i prefer "aptitude" rather than "apt-get". so let's install it.
Code:
sudo apt-get update
sudo apt-get install aptitude
Now, let's search for firmware package names:
Code:
aptitude search "firmware-"
Search through the list and if any of the drivers are for your wireless device, then install them. For example "Intel Wireless" would be:
Code:
sudo aptitude install firmware-iwlwifi
Lastly, I am unsure about the touch-pad issue.