I have done a bunch of moose hunting from a canoe. It can be a very effective way to hunt. Here's what I have learned...for what it's worth:
1) Noise,even a little bit, travels far and loud across the water and can really hamper your efforts. I drop those closed cell blue foamies in the bottom of the canoe and that helps. I can't emphasize enough how far and loud the noise will travel!
2) Paddle straight at moose when you see one. They have bad depth perception and will let you come in really close if you are paddling straight at them.
3) Plan who is going to shoot first and set up the rifle so it's easy to reach. Each guy should paddle from the opposite side of his partner and try to shoot on their strong side...So if you are right handed you will likely want to shoot to the left side of the canoe. The front seat guy should figure out how to shoot forward when both seated and kneeling in the canoe. It easier to shoot when kneeling so I prefer to kneel all the time if I'm in the front.
4) Make sure rifles and paddles are not going slide off seats or gunwales when you are not using them. It make a hell of a racket when they fall.
5) Keep in mind the the guy in the back can't glass and paddle at the same time...somebody has to steer the boat!
I'm sure i learned more but I can't think of more tips.
Have fun!