I too stumbled along trying to get the fileserver up and running, and I'm happy to say that I'm very close, it would be done but because I'm so particular its not.
So what I found searching was the following site;
and his link to his Home Network Setup Tutorial and in particular the third and fourth sections on Server Config and Setup (which really is about users/groups/shares) - while the info is about three years old it is still very very close to the WebMin in the TKL FileServer app. Just a text tutorial but it helped me and to be honest with out his site I doubt I would be as far as I am with the setup.
Alon - I believe you had mentioned needing docs for the appliances in a PDC thread , might be wrong but these might be a start at least for the fileserver. Just my three cents.
Hope This Helps