ok , first off do you own a domain name such as www.blablabla.com?
if so you may just have to reconfigure httpd,doing that is pretty straight forward. If not, and you still want to run httpd, check into a redirect service like dyndns( www.dyndns.org
) and set up an account <------its free for 5 domain names. and download and install one of the update clients they offer, this will keep your domain name the same if you should change your ip address( like say you have a dynamic ip) IF you use pppoe use the ip of the PPPOE connection in the ip adress feild of the setup utility. then use whatever you picked as a domain name for the domain part and your set. I have run many a website this way on linux and windows and the proceedure is pretty much the same.
hope this helps