Despite a major architectural change in the product design the installation part of 12C database remains mostly the same. The only notable difference is when you create a database you create two different types of databases.
CDB, which is basically a container database and will not hold any user data and
PDB, which is pluggable database and can be more than one. PDBs will actually hold the user data and ideally there should be one PDB per application (adhering to multitenant architecture).
Here are the complete installation steps performed on Virtual box running Oracle Linux 6 64bit.