I'll second Drew Fritt's book on marbles. Although it is aimed at working with soft glass, the design techniques can easily be translated to borosilicate marbles too.
Additionally, The Flow Magazine has some marble issues that are decent. Glass Line Magazine is also great when it comes to the tutorials. If I had to pick one or the other, I'd go with Glass Line as it is now.
Lastly, Youtube is a great resource. Corning Museum of Glass has a couple of John Kobuki's videos which are great. I personally prefer his first video, though. Also, Revere Glass has a channel with some very professionally-made videos which focus on making marbles. However, most of the channel is focused on blowing pipes. But there are a few techniques they teach which can be used for making marbles too.
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