If you spend many nights outside, and I hope you do, at some point you'll try messing around with longer camera exposures.
20 years ago, that involved slow film, slow shutters, and lots of disappointing trips to the Fotomat. 10 years ago, it would take a digital camera with a good manual mode. Today, you can just use your mobile telephone/flashlight/camera/jukebox device!
If you're just looking to futz around and get a feel for it, I'd recommend the Slow Shutter app for the iphone. It'll put you back $1.99 but let you do pretty much anything you want related to long exposures. You'll need a tripod too. (I personally like the smaller Joby options but cheaper ones work fine, as does pretty much any stable area to place your phone.) Once you're set up, grab some different light sources and start messing around. And... this concludes the tutorial!
Now for inspiration, let's get to Darren Pearson. AKA Darius Twin. AKA a guy that's definitely not messing around. He creates the coolest creatures you could ever hope to see using nothing but light. In doing so, he also creates a momentary window into an achingly beautiful alternate reality that I so wish was real.
Darren was originally inspired by Picasso's famous light paintings and it shows, in the most magical ways.
Just as impressive as his work, Darren's built a career, and business, around light painting. Another shining example of "do what you love, and the rest will come."
You can see more of his work right here yo.