Now you have to install a server on the raspberry pi, the easiest is the Apache Server (Lighttpd also works if you are looking for something lighter) run the following commands to install Apache, PHP5, PHP5 mod for apache and MYSQL( if you are planning to use a CMS or a database.
sudo apt-get update
sudo apt-get install apache2 php5 libapache2-mod-php5
now you should allow overrides by editing the 000-default file, you can do that using the following comands..
sudo nano /etc/apache2/sites-enabled/000-default
now edit the following lines
change "AllowOverride None" -to "AllowOverride ALL".
now execute
sudo service apache2 restart
to restart apache witht your new settings
now your site should be up and running u can go to /var/ and change the permissions on www, making it writable.
cd /var/
sudo chmod 777 /www
this will enable you to login using WINSCP and upload HTML pages to your new site. open the browser on your PC and point to 192.168.xx.xx (ip address of you raspberry pi) to view the default page.
You can also install and SQL server using the following comands, with a PHP and SQL running on your server u can have a CMs like Drupal running on it.
sudo apt-get install mysql-server mysql-client php5-mysql