I feel like PP had good advice. I also went to one bridal show, before I even started planning my wedding. That was when I figured out that I didn't want a fancy, formal wedding.
Also keep in mind that vendors are there to sell you things. There were services advertised at the show I attended that I would have never thought of (like tanning packages) but they were trying to convince me that my wedding wouldn't be complete without them. Also, do not give out any contact information at any point in the show, because I can almost guarantee that some of the vendors will sell your information.