You can pipe the command to less
like ifconfig | more
. Read the man page for scrolling forward and backward.
As for screen resolution, I think it depends on the desktop whether there's a little widget you can use for screen resolution. I'm pretty sure on my KDE desktop there was one somewhere in the system menu (I'm not in front of my Debian box right now). Worst case you have to edit your xorg.conf file.
Oh, and Lenny is 5.0. Etch was 4.0.