I hated my wedding pics. I told the photographer I liked candids, he took that to mean I wanted pics of all the guests as they arrived. Blah!
Scout out your venue. Find places you'd like photos taken. Have a list of traditional poses you'd like and go over them. Look through his portfolio and see if there are wild and wacky photos you like. If he doesn't have any really great "candids" I would say he's probably not the photographer for you.
Also, keep in mind the temperature and position of the sun at the time of photos. If you have a great location in mind, but the sun will be shining in your eyes and you'll be sweating bullets, your photos will not turn out quite so grand.
Have options. Give your photographer enough guidance to know how to make you happy, but enough leeway to be creative. The creative shots are usually where the magic is, but you want those traditional shots, too.
Good luck.