multiple local domains under apache

Hi, sorry for posting this slightly off-topic post, i wasn't quite sure where to post it and i thought it might interest some. I am designing a number of websites under RH Linux w/apache, php, mysql and was hoping to get Apache to serve up these different sites to me from my hard disk. Does anyone know how to do this ? (with different local domain names....) I tried looking through the apache docs and couldn't find any info - i tried setting up a virtual hosts sytem but it didn't seem to work. How does everyone else do this ? any help greatly appreciated Nick