Mostly you want to read the "Beginner's Guide" document in the internal SE wiki (but see below re password). Jocelyn Simmonds, Neil Ernst, and I have written a fair amount of useful text there. And it's a "wiki", so you can add to it.
To access the above URL on the "internal SE wiki", your web browser will demand your CSLab user name and password. But to edit it, you need to "log in" to the wiki itself. Here is information about activating your accounts on the SE wiki.
That's the only document I have on the web which is relevant right now. If there are other things you'd like me to write, please let me know!
Many things about using CSLab machines and networks can be found under http://support.cs.toronto.edu