I think breeding Glofish might be illegal; can anyone confirm/deny this?
If it isn't, they'll be exactly the same as the normal Zebra Danio (which is basically what they are). There is plenty of info online about breeding Danios; they're not that hard. The females will be larger, more stocky and less intensly coloured than the males. You would need to set up a breeding tank with lots of fine leafed plants or spawning mops and you'd have to remove the parents after spawning. You'd also need a source of very tiny live food, such as micro-worm for the fry.
Hope this helps.