Finally have Qmail running

After breaking down and buying the book "Running Qmail", I know have Qmail
running. The one thing the book did not get into was setting up virtual
users with POP3 (ie. virtualuser_1@virtualdomain.com,
virtualuser_2@virtualdomain.com ). I've seen about 4 different ways or
addons to qmail to pull this off. Im looking for the method to do this that
will work with qmailwebmin if at all possible. I need a graphical interface
to do this because I may have someone (not experienced with linux, much less
qmail) manage some parts of this.

Thanks,
John Albee
john@empresamexicana.com