Unable to start oracle Database

[ved]

Hi
i am installing oracle database 10g2 in my fedora12 with the help of this link
ORACLE-BASE - Oracle Database 10g Release 2 (10.2.0.1) Installation On Fedora 7 (F7)

Now i am start my Database using sqlplus:

[oracle@localhost ~]$ sqlplus

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Sep 16 10:53:47 2010

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Enter user-name: /as sysdba
Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area 167772160 bytes
Fixed Size 1218316 bytes
Variable Size 67111156 bytes
Database Buffers 96468992 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
SQL>


But i m not able to start this in my browser window i.e in graphical mode
http://localhost.localdomain:1158/em.../database/home

show error
http://localhost.localdomain:1158/em.../database/home
Unable to connect


Firefox can't establish a connection to the server at localhost.localdomain:1158.

* The site could be temporarily unavailable or too busy. Try again in a few
moments.

* If you are unable to load any pages, check your computer's network
connection.

* If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.

So suggest me what i have to do
thanks in advance

[nmset]

You should perhaps start Enterprise Manager. As far as I remember, it's as follows :

emctl start

Check the documentation for this Oracle specific issue.

[ved]

thanks fo reply i run the comand and output is :


[oracle@localhost ~]$ emctl start
TZ set to Asia/Calcutta
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
Invalid arguments

Unknown command option start
Usage::
Oracle Enterprise Manager 10g Database Control commands:
emctl start| stop| status| setpasswd dbconsole
emctl secure <options>

emctl set ssl test|off|on em
emctl set ldap <host> <port> <user dn> <user pwd> <context dn>
emctl blackout options can be listed by typing "emctl blackout"
emctl config options can be listed by typing "emctl config"
emctl secure options can be listed by typing "emctl secure"
emctl ilint options can be listed by typing "emctl ilint"
emctl deploy options can be listed by typing "emctl deploy"

what i have to do

[nmset]

emctl start dbconsole

[ved]

thanx a ton , finally i cud start.