Hi there BajiRahaman,
Here you go:
Instructions from the official CRM 2015 Implementation Guide <-- everything you need to know is here:
1) CRM 2015 Implementation Guide on TechNet:
A) https://technet.microsoft.com/en-us/library/hh699706.aspx
B) https://technet.microsoft.com/en-us/library/hh699742.aspx
2) or download the CRM 2015 Implementation Guide here:
https://www.microsoft.com/en-us/download/details.aspx?id=45022
Other resources online:
1) http://dynamicsessentials.net/2015/01/28/step-by-step-dynamics-crm-2015-installation-guide/
2) https://www.youtube.com/watch?v=Rz-c0lF4LAc
This one is for CRM 2013 but applies to CRM 2015, very helpful:
http://blogs.msdn.com/b/niran_belliappa/archive/2013/11/05/step-by-step-installing-dynamics-crm-2013-on-windows-server-2012.aspx
Good luck & happy CRM'ing!
Cheers.
ProgCRM