All the info and configuration of the Apache web server is in httpd.conf which resides in either:
This file contains everything you'll need to know about YOUR system. Take a read through it, and somewhere in there you'll have a variable for the "Document Root"
To find it an easier way, use the command
cat /etc/apache/httpd.conf | grep DocumentRoot
That'll output the line with DocumentRoot and tell you where the base is for the server.
That's where you'll want all your web pages to go. Alternatively, you can change the DocumentRoot variable to wherever your web pages are now.