Realistically there's a myriad of free information on the internet that will get you started
there's also a bunch of classes offered at tradeshows like LDI
I second this. I've taken a few class before - well, was sponsored to take classes - and while they was interesting to an extent I can't really say they bettered me as a lighting designer. I've taught classes before as well, though admittedly at the regional/community theater level and not the LDI level, and both as a teacher and a student I feel classes are best if you're trying to learn a very specific thing (console programming, setting up a specific media server, etc.). I'd pay money for that if I think it's a skill I could use, but I don't want to pay to hear a lighting designer profess his/her idea of what good lighting should be. As an aside, the classroom portion of my pyro training was probably the most interesting class I've ever taken.
If you're looking for inspiration on your next design, try Youtubing various concerts, clubs, DJs, bands... and cherry pick the ideas that you like. I've found that quite useful myself. Lighting design is just as much an art as it is a skill. Show him some TSO or Pink Floyd to get the creative juices flowing! Hope this helps!
