I'm assuming that you have installed Apache already and that you have edited /etc/apache2/sites-enabled/000-default to change the AllowOverride None to something like this:
<Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory>
If you have not already used this command
sudo a2enmod rewrite
then do so in order to enable mod_rewrite.
Now edit your /etc/hosts file and add an entry that points to the server where you are setting up the virtual host.
The line should look something like this:
Where the IP address points to the server where you are setting up the host and mysite.local is a nickname for the site. Remember to add the .local :)
Now create a file in /etc/apache2/sites-available and name it something that relates to the sitename (for future maintainability). I would suggest naming it the same as the sitename. Edit it and copy this basic skeleton structure into it:
<VirtualHost *:80> ServerAdmin firstname.lastname@example.org ServerName mysite.local ServerAlias mysite # Indexes + Directory Root. DirectoryIndex index.php DocumentRoot /var/www/mysite/ </VirtualHost>
It is important that the ServerName matches the entry you made in your /etc/hosts file.
Now run the command a2ensite mysite.local which is a Debian convenience command which creates the symbolic link from the file you created to the /etc/apache2/sites-enabled/ directory.
You will need to restart Apache (service apache2 restart). If all is well you will be able to navigate to http://mysite.local on your local machine and view the site present on the server at /var/www/mysite