depends on the quilt= some i add before quilting- others i add before the binding-so the binding covers a side and bottom of the label.
i always sew them on- they do not hold up just being fused- if the quilt will be used and laundered-
what to put on the label?
i put the name of the quilt-
if i used someone's pattern- i include that information- if i designed the quilt then i put that i designed-pieced and quilted it. if someone else were to quilt it i would include that information- the date (usually just month and year)
my city--state
and care instructions/fiber content (if i use a poly batt- or something else...wools my fav...i include what ever i've used...such as quilt top and bottom 100% cotton- batting dream wool...