Hey there Toni,
Assuming you have apache installed - along w/ anything you'll want to use like php, mysql, etc.. you can set up a web server relatively easily..
First off, create a spot where you want your site to live - let's say you're setting up Linuxforum.com:
Code:
mkdir -p /home/sites/linuxforum.com
(the -p will create parent directories if they don't exist)
Then, edit the /etc/httpd/conf/httpd.conf (CentOS, Red Hat, etc..) to add your site. Add this to the bottom of the file:
Code:
<VirtualHost *:80>
ServerAdmin [email protected]
DocumentRoot /home/sites/linuxforum.com
ServerName www.linuxforum.com
ServerAlias linuxforum.com
ErrorLog logs/linuxforum.com-error_log
CustomLog logs/linuxforum.com-access_log common
</VirtualHost>
(replacing w/ your info of course)
Restart apache:
CentOS/Red Hat/etc..
That will get it going in a very basic way and bring up a website on the box assuming it's the same ip as the server.
Like gcawood said - if you're newish to Linux, we'd suggest going with control panel software like cPanel at first.