I have two standard labels. For example:
Star shine quilt by Mary Smith
Designed by Jane Doe
Somewhere, xy
Date
Or:
Summer breeze quilt by
Jane Doe
Someplace, xy
Date
If it is for my family or a friend I may include a note on top part of the label.
I am sure this is not the "right" or the only way but that is what I do.
Good luck!