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In this video, I have explained the oracle 12c full installation .
here is the link for oracle database 12c download
in this link u can find 12c download
You have to register for oracle to download this
LINK-------------------------------------
http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html
Here by using this command u can create new database that is pdborcl ... u can name this as u want .. past the code in the file
CODE FOR NEW DATABASE -------------------------
PDBORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = pdborcl)
)
)