Hi, did you try to check whether the httpd is already running? (open a browser window and type http://localhost
If it's not running, you should do, as root:
$ /apache_install_path/bin/apachectl start
This works on SuSE... not sure about RH.
Then you can configure your linux box to automatically start Apache.
On the web there's plenty of documents detailing all necessary steps... Try googling a bit!