TheFlyingCamera
I'd offer the idea of taking a nude photography and/or drawing class as part of a group BEFORE trying to do it on your own - nude photography is not a natural activity for most of us, and trying to do it the first time without guidance of a more seasoned artist is daunting at the least, and perilous/traumatic at the worst. That said, it is totally worthwhile, and if you can get over the initial hurdles, kinda addictive.
As to techniques you can practice without a live model, one thing you can do is start off REALLY basic - after all, just as there is only one sun, start your lighting practice with a single light. Go out and get yourself one of those little poseable wooden mannequins art students buy to learn anatomical proportion. Set it up with a single light source (a cheap gooseneck desk lamp makes a perfectly acceptable studio light for a subject like that). Move the mannequin around in different poses. Adjust the position of the light relative to the mannequin - higher/lower/closer/further. Try adding in some diffusion - put a piece of paper or fabric between the mannequin and the light source (keep it a safe distance from the light - you don't want to burn down the house while you're learning). Vary the distance between the light and the diffusion, and the diffusion and the model, to see how all these things affect the appearance of your subject.
As to techniques you can practice without a live model, one thing you can do is start off REALLY basic - after all, just as there is only one sun, start your lighting practice with a single light. Go out and get yourself one of those little poseable wooden mannequins art students buy to learn anatomical proportion. Set it up with a single light source (a cheap gooseneck desk lamp makes a perfectly acceptable studio light for a subject like that). Move the mannequin around in different poses. Adjust the position of the light relative to the mannequin - higher/lower/closer/further. Try adding in some diffusion - put a piece of paper or fabric between the mannequin and the light source (keep it a safe distance from the light - you don't want to burn down the house while you're learning). Vary the distance between the light and the diffusion, and the diffusion and the model, to see how all these things affect the appearance of your subject.