In order to be able to make all the steps you must initiate the session in the database with a user with administration permissions, you can use the SYSTEM user, for example
These tablespaces are the location where Oracle will save the objects of the scheme which we are going to create.
Tablespace for data, with initial size of 1024 Mb, and autoextensive
CREATE TABLESPACE "APPDAT" LOGGING DATAFILE '/export/home/oracle/oradata/datafiles/APPDAT.dbf' SIZE 1024M EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO
CREATE TABLESPACE "APPIDX" LOGGING DATAFILE '/export/home/oracle/oradata/datafiles/APPIDX.dbf' SIZE 512M EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO
CREATE USER “APP” PROFILE “DEFAULT” IDENTIFIED BY “APPPWD”
DEFAULT TABLESPACE “APPDAT” TEMPORARY TABLESPACE “TEMP” ACCOUNT UNLOCK;
If you want to access the Oracle 9i online documentation you can do it following the link
Is the original Oracle Help installed in a public access site.