In this post, I have provided the steps required for installation of both Windows Server 2012 Standard Edition / Datacenter Edition - Server Core Installation, Server with a GUI
First, your system should meet the basic requirements, otherwise you will not be able to install this OS correctly.
After completing the first step, follow the given steps below:
1) Insert Windows Server 2012 DVD into your computer.
2) Boot it from DVD
3) Press Enter when "Press any key to boot from CD or DVD.." prompts on your screen
4) Choose your Language and click NEXT
5) On the next screen, Click Install now
6) Select the operating system you want to install ( for ex- I have chosen Datacenter Evaluation-Server with a GUI)
14) It will ask for password to login into the computer. Enter your password here.
To download the evaluation copy of Windows Server 2012, Click on this link- http://technet.microsoft.com/en-in/evalcenter/hh670538.aspx
Hope it helps!
If any improvement is required in this post, please post your comments/feedback so that we can provide much better solutions.