Vimacs comes with some documentation (see the vimacs.txt file) that may be helpful. Keep in mind that the Vimacs documentation is in addition to the extensive Vim documentation, which is divided up into tutorial and reference sections, so that both beginners and advanced users can use it.
If the Vimacs documentation doesn’t help you, feel free to email me—my email address is at the bottom of the page. Sorry, there’s no mailing list.
If you’re looking to learn Vim from a book, I highly recommend The Vim book by Steve Oualline. I learnt to (ab)use Vim from that book.