Sharing OS X Server
To configure your server, you must use the "Workgroup Manager"-app. To start the services (all of 'em) you must use the "Server Settings"-app.
You must be the admin user ofcourse, and if you're not familiar with OS X Server, or AppleShare IP (or even NT server for that matter) then you will need some time getting used to setting up users/groups and sharepoints. It's good fun learning though!
In my opinion there is no harm in TESTING software before buying. But you must buy software if it fits your needs. Especially Apple's own gr8 software...
So go ahead, and enjoy.