There is currently no "automagic" method of converting a complex publication to epub. The programs that claim to fail dismally on all but the most simple material.
But you don't need an epub. Export as PDF from your Publisher documents. Upload them to your webspace and put links on your web site. That's all you need. PDF is as near to a universal format as makes no difference. The tiny number of web site users who might not have the reader installed as standard can download it for free. There's no reason to complicate the issue with providing alternative formats.
If you want to display pages directly on the site, export a JPG as well and place it as a graphic in the usual way.
You could consider learning a better design program than Publisher. All that "easyness" is very restrictive.
Last edited by exaltedwombat; 02-16-2013 at 10:13 AM.