You should install (maybe you already have) httpd, which is also called Apache. The configuration files are in /etc/httpd, the main configuration file is /etc/httpd/conf/httpd.conf - open it with a text editor and modify contents. By default it has a lot of comments to guide. If you don't understand an option, then keep it unchanged.
Basically you will have to add your own IP address and define at least your default hosted site. But even without a custom site definition it will bring up some default contents from /var/www/html. Go to apache.org and read the documentations and any tutorial you can get.