I would first arrange a trial in order to get some ideas on what you want and what works best for your style and plans for the big day, then go from there.
Meeting different types of people, and having different skin types and faces to play with, as well as being a part of your big day!
Skin! Eating healthily and drinking plenty of water in the run up to the day will give you a natural glow from within, and help your skin be hydrated and clear of blemishes.
A good setting spray will help keep your make up in place throughout the day and can be tailored to your skin type.