I have found a lot of guidance from this section of the Gregorian Chant category on this forum in the past:

http://musicasacra.com/forum/comments.php?DiscussionID=54&Focus=503

Many of my questions have been answered there.

There seems to be little guidance offered to those of us who want to leave the GIA/WLP/OCP imposed forms of musical resources in their annual misalletes for the hands of our people.

I thank this list for the help that they have provided for us who have made the decision to offer alternate music programs that are tailored by us to bring the people to chant, using the vernacular to awaken them to the value and depth of chant...and an appreciation of the value of Latin as a long term goal.

noel at sjnmusic.com