There has been some advice and tips posted here before Kimmers and Bravo on your first Gig and some Pro work... I too always use 2 bodies and the 24-70mm and a 70-200... If you have Pro help re the organisation and timing you are going to have a great start... Back-up plans are vital such as another venue that will look good in the event of poor weather, maybe more of an issue here in the UK than where you are.. 

I am sure you have the eye to be able to show off those talents we have come to admire here to do something just that little bit different, than the usual "Run of the mill" style images one can often see, in a lot of wedding photography.. 

Hugz 

And good luck

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt