It's been a long time since I've used Mandrake so I can't help you with that. I can tell you that if you log in as yourself (a normal user) you can open a terminal and su (switch user) to root. You'll be the only one to know that password though since you set it when you installed the system.
Getting used to the file system takes time. I'll try to find a link for you concerning that one.
I'd forget about the PCMCIA nic right now if I were you. Don't mean to sound ugly but if CMonster had trouble with it I'm afraid you'll only get discouraged if you try something like that right off the bat. All things come in time..
I'll see if I can find some linkage for you on that one as well (it'll be much later tonight though - I've got to get to church and then hit the grocery).