alright. Macs are weird, when you first use them you feel like you have one arm tied behaind your back, but after awhile you get use to it, and then its not realy that bad.
to get to the command line you go to aplications --> utilities --> terminal
it starts you off with a krsh shell (i think) but I use bash so I switch right away.
Root is normally disabled, this is done by giving it a blank password, so in order to become su you have to give root a password...
sudo passwd root
the administrative password and the root password is not the same thing, (but it can be).
Lots of people will tell you that just use sudo instead of allowing root to become active, but typing sudo before everything just irritates me.
But you shouldn't have to do that to connect to a smb (windows file and sharing) server. I just hit apple-k to open the connect dialog and then just pick the correct workgroup and stuff. Once you connect you can just drag the desktop network icon into the dock bar, just put it between the trash/disconnect icon and the line that seperated it from the shortcut icons. That way you don't have to redo the connect part, just hit the shortcut in the dock.
I wouldn't mess around to much in the command line untill you get familar with OS X. OS X can be pretty picky with the different settings and it's not that hard to accidentitly brake something just by doing simple stuff. Use the GUI crap first and then use the command line just for a backup control.
ALso if you are getting authentifaction errors and stuff you may need to download and install the Microsoft Authentification module thingy to deal with window's security (icompatability

) stuff. We have to do that in order to deal with the W2k's authentification and domain crap.