make sure you have an agenda ahead of time... don't go into it blind. have a set number of shots u want to get, and get them, anything else is gravy. since its his first time modeling, try to walk him thru it as much as possible, giving the best direction you can, but dont be pushy. talk to him, have conversations about everyday things during the shoot, so he wont feel like a some pot of flowers... but a person. im not sure what kind of looks your going for, but sometimes the simplier the better... dont get worried about really elaborate backdrops - they can overpower the human body sometimes, rather then compliment it last - bring baby oil - have him cover himself - but not w/ the whole bottle, just a thin layer will add some sheen to his skin tones