Create a new database on machine which already has one database running?

Hi,
How can I create a new database on machine which already has one database running on Windows platform?
I am totally new to DB and this is the first time I am creating a database.
When I installed Oracle on windows platform database MYDB got created.
Now I want to create another database with the following command on the same machine.
CREATE DATABASE TESTDB
     DATAFILE 'F:\oracle\oradata\testdb\system01.dbf' SIZE 250M REUSE
     CHARACTER SET US7ASCII
LOGFILE
     GROUP 1 ('F:\oracle\oradata\testdb\redo01.log') SIZE 10M,
     GROUP 2 ('F:\oracle\oradata\testdb\redo02.log') SIZE 10M;
But it doesn't work. I unmounted the DB MYDB and then again tried above command. But still didnt work.
How can I create a new database on machine which already has one database running on Windows platform?
Any sort of guidance is appreciated. Thanx in advance.
latin.

Use DBCA.its a GUI tool for creating the database.

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