There are two ways to create a new database on existing oracle db server. One is using 'CREATE DATABASE' sql statement[this is too long,hard for me]. Another is using DBCA(Database Confguration Assistance), GUI Base Program. This way is more easy and I choose this way:). One note here is DBCA need X to run and I want to remote login to db server and run dbca from ssh, so ssh need '-X' for X11 forward[assume that DISPLAY variable on server is set, if not try 'export DISPLAY=localhost:0.0' on the server].
[san@acer ~]$ ssh -X -l oracle 10.42.80.39
Warning: No xauth data; using fake authentication data for X11 forwarding.
Last login: Tue Jun 2 13:28:48 2015 from 10.0.2.2
/usr/bin/xauth: creating new authority file /home/oracle/.Xauthority
[oracle@crmdev ]$ cd $ORACLE_HOME/bin
[oracle@crmdev bin]$ ./dbca