I don't know which one to pick for someone like me who has never configured a server before
What is the name of a practice lab that shows you how to configure a basic server?
Most of the practice-labs environments are designed with a set of skills in mind for exam preparation. So there is no guided lab per se on what I think you're trying to accomplish...but the closest that you may have that will be a guided experience will be with
Installation Storage and Compute with Windows Server 2016or
Installing and Configuring Windows Server 2012,if you're referring to Windows Server. On the Linux side, you may find
Linux + Support Skillshelpful.