The HDD is an older Quantum 5.25 series. Any installations hints or tips would be greatly appreciated.
Thanx 
The best tips and hints for a beginner you get from reading the Technicians Handbook found on the Documentation page under Manuals (you need a pdf-reader).
Pay attention to the chapters on requirements for a working server.
Personally I think your old Quantum drive is a nogo.
I tried one myself some years ago, and if I never see a Quantum drive again it'll be too soon, if you know what I mean.
But if you read the Technicians Handbook thoroughly you are well on your way, even if it relates to the Mitel version of SME, which they call the MAS 6000.
Just ignore that. The information is valid.