Hi,
See Oracle is not like UNIX that we can get the "help" feature just by typing help <command>.In order to get help on any command in Oracle,u have to get the Oracle documentation.U can download the documentation from Oracle CD when u install Oracle.There is a folder call DOCS in ur Oracle home directory.Otherwise install it.In case of any doubts write to me at [email protected]

Regards,
Rohit Nirkhe,Oracle DBA,OCP