Wedding Fair/ Wedding Show Photographers

Hello,

I`m going to my first wedding show in September.
And I dont know how to prepare... i have all my prints, albums and business cards and other stuff.

I wander what to do about brides. Do I sign any kind of agreement with them when they want to book?
I don`t supose I take any deposid while the event?
And the questions goes like that... but the most important is about contract or agreement, do I take any contact details? or should they contact me?

Please Help :)