Help with Compaq pro server PC750

Hello im a newbie and a company i was doing some work for were getting rid of some pc stuff?, Well it was a Compaq PC-750 800Mhz Server,so i fired it up last night,and it went through all the start up stuff, but came back No operating system installed, Anyway my freind gave me a new with key code sticker copy of Windows 2000 server server service pack 3 ,he said they would neve use it again,my problem is how to configure this machine since it has 3 scsi drives installed in it ,and im a idiot on scsi stuff?? any one have a clue as to how to restore and use this machine???Thanks