create database

using dbca to create a DB

select create database option
specify type of database
specify global database name and sid
select features
select database operational mode
specify options for memory, character sets
database sizeing file locations and archiving
define database storage parameters
select option to
   create database
   save as a template
   generate creation script
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create database manually

choose a unique instance and database name
choose a database characte set
set operating system variables
create the initlization parameter file
start the instance in nomount stage
create and execute the create database command
run scripts to generate the data dictionary and accmplish post
creation steps
create additional tablespace as need
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detail step

http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/create.htm#sthref220