where to put files
First I would like to congratulate you for a fine job on EHCP. I just installed it on my ubuntu box with no problem at all.
Here goes the purpose for the web server, many family members including myself and a couple good friends have websites, (business, blogs, etc) and since we all have fully functioning websites with several different hosting company's, so I proposed to host them all on a server I was going to get.
Since you are a newbie regarding webserver topics, i only suggest you to put files after you setup your domain in ehcp, to what you see in your ftp account. Login to your ftp account that you setup your domain in, then put your files in root of ftp, into yourdomain.com directory...
for example, you setup aaa.com domain, in your ftp of ftp1, then, when you login to your account using ftp, you should put your files in dir /aaa.com/httpdocs/ ..
if you know deeper in server directory, same files reside in /var/www/vhosts/ftp1/aaa.com/httpdocs
ask me if you have other questions..