If you do not understand the Apache documentation ?????
The Doc's are very strait forward and easy to use .
the httpd.conf is VERY well documented - so documented in fact that once you remove that it is 1/10th the size.
then you have a problem
what you might want to do is start from scratch
remove the deb install and install from source .That way YOU LEARN how to set it up and configure it .
you might also want to go over to Amazon and buy a book
form : O'reilly
"Apache - the definitive guide "