1)How to find out from sqlplus what is the current
database ? 

once, connected, do "select * from v$instance;"

2)and how to switch to another one ?

from DOS prompt: by chaning your ORACLE_SID environment variable
or via Net8: either from SQL*Plus: connect system/manager@another_db
or from DOS: sqlplus system/manager@another_db.

3)How to create users in my new database ? after
creating users do I have to do something to allow them
get connected from another machine ?

create user scott identified by tiger default tablespace users temporary
tablespace temp;

grant connect to scott;

4)Do I need to create a tablespace for my new
database, if so how to do it ?

OK, now I am gonna suggest you to read the Oracle's documentation:
especially the "Administrator's Guide".  It's availabe on otn.oracle.com.

5)How to create tables ?

See answer for #4.

Thank you your help is appreciated.


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