Check out
www.modelmayhem.com for ideas
It's really no different than taking portraits except you will want to vary up poses and clothes a bit more. You can ask him if he has a make-up artist (MUA) he wants to use, but that should be at his cost.
Model shoots should be fun...at least I think so. Check out Model Mayhem and see what others are doing and go from there.
Good luck!