Need Help GoFlex Net (no replies)

Hi,
i have a seagate goflex net and i wanted to install a simple NAS or Samba.
The Goflex had no SSH and i was not able to enable it.
So i ordered an USB Serial interface and now i can use login on serial port.

after this i testet a lot i found on google but nothing worked.
Last i installed a script that installed arch linux.
But i want a small emdebian into nand with ssh or samba without USB stick
(i have an debian server on my PC and i understand better how to change things)

but i dont kwow how to install Debian from arch linux.
i can log in and install packeges, but how can i install a debian like described here
http://forum.doozan.com/read.php?2,72

What i want is -use any USB Drive connected to goflex- on other PC over Network
hope anyone can help me.
maybe step by step. i dont understand that arch linux... i am debianer ;-)

i think i need mtd-utils + wget, so i installed this on my arch.