The Glassblobbery doesn't offer an in-house glass staining course. We do however recommend "Stained Glass For Dummies" to anyone looking to get their foor in the door.
In the book you'll get detailed and fully illustrated instruction on all sorts of techniques from traditional leaded stained glass to hot glass–working techniques.
They also have a Kindle edition if you're into that kind of thing!
With beautiful illustrations and easy to follow exercises it is by far our favourite guides to the ancient art.