Quick Job Fixture in Linux/Apache

Linux worker invited to fix quick fixture of following : 1) 503 Service Temporarily Unavailable error in browsing one domain. We installed open meeting on this domain. 2) We have two Static ip address on this server. We like to add this ips for two different application on port 80. Also we like to add two domin. We need a instruction note for above two things. Its a simple and quick todo, expert can complete in 10 mnts, and may start up of long term relationship