The decision as to how, or what you do for your first dance is a big one. Most couples just do an awkward shuffle across the dance floor, with the groom spinning the bride one or twice or not at all.
I guess everyone would like to do a big routine, and look like a glamorous couple, but the truth is most people do not have the confidence or the skills, to be able to pull such a feat off. One thing a couple can do is watch other people's first dance on line for ideas. It maybe that some one has done a routine that looks fairly simple, and on seeing it, they feel that they can pull it off.
Another idea is to get a professional dance coach, to choreograph you a routine and teach you it. It is amazing how a few lessons and tricks of the trade can vastly improve a person's dancing skills. If you are going to go for the big routine, here is a few pointers to help you get it right on the day.
1, Go for a minimum of three lessons, that way the coach can iron out any issues you have.
2, Practice as much as you can at home. The more you practice the better.
3, Make sure you practice at the venue, to get used to the floor and to make sure you have enough room.
4, Make time on the wedding day, to go through the routine one more time. After the meal is a down time and is close to the first dance, so use that time.
5, Rehearse your first dance in the shoes you will be wearing on the day. There is no point in rehearsing in different shoes, because they will have a different feel and grip to the floor.
6, Remember that most people see how much the dancers are enjoying themselves as an indication of how good the dance is. Most other people know nothing about dancing, so they will not notice if you make a mistake. They will if you make it obvious by reacting to it.
I am not a dance instructor, but have picked these tips up from talking to bride and grooms over the years. If you do get a professional dance coach, then they will tell you much of this and more. Best of luck, and remember that its all in the preparation and practice.