Your question is somewhat vague. Here are some possible answers.
- If you are interested in just using it as a server in a technical fashion, that happens immediately if you do
notebook()
in the command line! Or with sage -n
; you are now using the server. - If you are asking about documentation for server options, do
notebook?
and there is a lot of documentation about it there. - If you are asking about a public server for others to use and some of the networking details, here and here are some possible instructions for you that others have found helpful.
Good luck!