Also I HIGHLY recommend that you interview your photographers beforehand. Face to face, preferred. You get a feel for their style, what they can offer, and other factors that are best "felt out" beforehand. Professionalism is key as you want someone who is working this, not out there to have fun (it kinda sucks but this is the truth, it is work).
The photographer that shows up with their relevant-topic portfolio on their tablet for you to view, as well as a pricing schedule, and locations already scouted/known can make a customer feel a lot better than the guy who shows up in his PJs and says, "I've never done it but I'm sure I can do it!"
Kinda like interviewing realtors or wedding photographers. Need to talk to about 10 before you find a decent one. I would be more than happy to setup a time for a coffee or brew to come discuss what you are looking for. Make sure it is doable (most likely is) and that the end product will be what you want it to be. I can provide examples of entire shoots (already printed) to find out what suits you the best as I have many styles of shoots to choose from. On the flipside if you would like something different, this can be discussed. Long story short, having a plan BEFORE shoot day is preferred as "winging it" has a huge impact on the quality of photos produced.