Thanks

Yes I realize now it's much more fun. Since 2 hours I'm installing everything as I am at work. This n800 has greatly diminished my productivity
I'll try to hijack the XP of my gf which is the only one connected to internet and replace it with my debian to make a gateway.
And then I'll buy an AP, I need one with at least 2 ethernet ports because her PC has no wireless.

Poor gf won't have much attention this evening. n800 has the priority

Now I need to setup the ssh server. I've seen how to do it with public/private key in this forum.
But yesterday I also saw somewhere "adduser" but which repository (and the line for sources.list) am I supposed to put? Would be quicker meanwhile. I'm unable to find it again.