Redhat (which CentOS is derived from) has a service utility that is rather easy to use, provided you know the name of the services.
The 'service' command allows you to start, stop and restart services quickly. It's as easy as 'service httpd stop' (or 'start' or 'restart')
The 'chkconfig' command makes configuring services to start in defined runlevels easy.
The 'service' and 'chkconfig' commands are your friends ... well, at least they're mine.