Hello, Installing a Server OS is pretty much the same as installing a desktop OS. However, you must put into consideration a few things.
First off, you must consider the server function/role so that you can plan out the hardware specs for your server. Will this be for a File server? Database server? Esx host server?
Second thing is the Raid configuration of your disks. This part is important for hard disk faults/buffer time/redundancy.
To complete the installation of your OS, you must also plan out on how you'll be managing your server. Like backup solution, load balancing, remote connection, monitoring, etc.
Hope this helps.