Actually, do you have it INSTALLED already? For RH, just download the RPM and install it. After that, you will realize that apache works right out of the box! all you have to do is run "service httpd start". Then, go to the httpd.conf file and find "DocumentRoot". That will tell you what the default directory is. It's been a while since I did it, so I forget what the default is, but look at that line in the config file, and it will tell you. Then, just put all your web files in that directory, and go to the website! That's it.
However, just because it WORKS out of the box doesn't mean it works WELL out of the box. There is still a lot of configuring to do regarding security and other aspects. But for now, that will at least get it running! We can work on the rest later.