Albinas Elskus's The Art of Painting on Glass is the definitive source for traditional glass painting and staining.
The 140+ pages provide extensive coverage of materials, include notes on over 60 specific paints and stains. Elskus also discussing equipment (lots of information an on brushes), technique and firing.
The Art of Painting on Glass has gone in and out of print since it first appeared in 1980. Fortunately it is widely available today in both used and new condition.