Hi Samir,
I believe that http://dotlrn.mit.edu is intended to be the place for teachers to share best practices, although it isn't set up for this quite yet. I'm not sure what the plans are for "getting started" documentation, although we surely need some. What's your time frame? When do you expect to go live with dotLRN? We'll see what we can do to get the pieces together for you.
In the meantime, you raise some good questions here. What kind of documentation and support would people like to see from the user's perspective?