If it is easier for you all you would have to do is go into your local florist before you go. Place the order with them letting them know when you would like the flowers to be delivered and where then they will take care of the rest. You could call the hotel the day ahead or the morning of and let them know flowers will be delivered but that is not necessary.
I own a florist in Ma. Trust me you will not have any problems doing it. Another tip is to call a florist in Orlando directly yourself and give the order over the phone with credit card and you will save yourself the relay charge!! which can be a pretty big savings.
However you do it Good Luck, and have a great trip.