From my experience. DO NOT try to get fancy DURING the ceremony. Get your basic angle of the bride's face, groom's face, and one other angle that is more "straight on."
They key with the ceremony is good sound and solid stable shots.
You can get creative, artsy, and whatever else your heart desires during other parts of the wedding but please do not miss anything important.
In addition to the ceremony.....
-Anything else that is unique to their wedding
Have fun, but remember to keep it simple if this is your first wedding so that you do not cut corners.
I wish I could re-shoot the first wedding I did but I can only learn from the past.