As you know, SCCM 2012 is new version of SCCM 2007. there a lot of new features on Configuration Manager 2012. Most of them are about structure, other are about processes on management console.
as you know, there were two different installation on Configuration Manager 2007, primary site and secondary site. At the moment there is central administration site not including clients information and primary site that including all data of clients.
second part of installation, you have to install Central Administration Site to your organization.
There are some little requirements to install configuration manager 2012. SQL server 2008 CU10 or higher. be careful that SQL server 2008 SP2 and SQL 2008 R2 do not supported. WSUS 3.0 SP1 or later is required and BITS and Remote Differential Compression must be installed.
Click on Install
Read and accept term
Choose your the folder which the files are required while installation
Site code and Site name
check NETBIOS name of this server
choose the correct communication between clients and primary site
define connection type and server names of distribution and management point
Join experience program
check setting summary
as you see, the installation began