For the network configuration, I think I can found all the stuff I want
at
http://fr.tldp.org/HOWTO/lecture//NET4-HOWTO.html
(french version of the network HOWTO)

I've just tried to build a bootable USB stick.
But I don't understand why mounting miniroot.

In the next few days I wilkl try the following procedure :
http://www.knoppix.net/docs/index.php/FaqUSBBased