Hi Abhishek,
The pre-checks is the same for a "Heterogeneous Migration", as Sriram provided you with some links.
What I can advise you to do, as long as this is possible within your IT/Network environment, reuse the same hostname & ip-address physically (and use the same SID), and you can have a different hostname $ ip-address virtually, but this will made your Migration more easier/controllable.
The moment of switch between the old and new SAP system is a matter of OS-scripting and the biggest advantage is that everything will be the same on your SAP Landscape (STMS, SLD, Interface, etc).
I hope this will help you.
Regards,
Andre