Shoutbox

Once you have apache fully set up and you get the test page when you type the localhost thing in your browser where do you go from that? like how do I add my own pages. i gather i put them in the apache directory but there are so many folders within that.
And also how do i go about making the page visible to the public? I tried that no-ip website and signed up. however whenever i type my external ip into the browser or my no-ip address it goes straight to the login screen for my router with username pword etc.
Any help on this would be greatly appreciated.