Don't worry about questions.We are all here to learn something.
Assuming You've got Apache web server installed,the configuration can be found in /etc/httpd.You can look at files in there and reading the comments.
It's a good place to start.
If You'd make any changes to any files in that directory,Apache will need to be restarted by
If You'll do something wrong,Apache will tell You that it found an error and probbobly won't start.
Information You need is in one of the files in there.The directive You should be looking for is documentroot.Next to it will be a path to the directory,where websites are served from.
You can add system users by entering a command for example:
useradd -d /home/drepneu -g users drepneu
-/home/drepneu is the new user's home directory
-users is the user's default group
and drepneu is that user's name on the system
Next,that user should have a password.To give him one enter
The same command is used for changing passwords.
The above commands should be run with root privilages,so You need to log in as root.
To start the graphical interface (if it's installed) You can enter STARTX