OS X Yosemite, running the Server app comes complete with lots of awesome features to help you get up and running, started and owning the configuration of Apple Servers. One such is the built-in options to help manage your servers. Open Server, click Help, then click Server Help. You can then search and browse for information about things you’d like to accomplish using the Help Center.
Now, click the arrow for each service for information about configuring that service. You will see an arrow for each service.
Click the arrow for more information on that specific service.
And just like that, simple and easy-to-use documentation, available live on OS X Server. You will, of course, need to be online to use it effectively.