Keep both cams on tripod during the ceremony. Maybe one to the groom's side, where you can occasionally get closeups of the bride and one to the rear of the church (especially if static) or in front to the bride's side where it can occasionally shoot cu of the groom. If the 2nd cam is not at the rear, it can occasionally go wide to include minister and the couple, then (when you're sure the other camera is steady on a shot) go through the bridal party, cu's of guests etc.
Get lots of closeups and pay attention to audio. Mic the groom, the minister and any other speakers, singers or musicians. Do not use buit-in camera mics.
During the reception, work as a team with one camera on tripod shooting a bit wide and the other handheld shooting close. If your handheld abilities aren't up to it, have both on tripod but same idea, wide/close. Put a mic in front of a DJ speaker to capture that sound and another elsewhere for the ambient. When you get audio that is pertinent to your cu shots, blend it in.
Have fun.