My WH are generally quiet and lay very well. They can be very loud if they want to be. I've been getting an egg a day from each since they started laying a couple weeks ago. You can certainly get one of each breed. If they are raised together they should get alone just fine.
If you aren't planning on raising your own ducklings I would not recommend getting a drake. Generally speaking, you'll need at least 3 females to keep a drake satisfied. A flock of all hens will be perfectly happy without a male.
You'll need to be cautious of letting them go on the pond. They will be vulnerable to aerial attacks. Also, you'll need to make sure there are no turtles in the pond. Other have had problems with snapping turtles getting at ducks in the water. You'll also need to consider how you will get the ducks off the water. The will need a secure enclosure to protect them from nighttime predators.
If you have the space you may want to consider getting three ducks. If you get two and something should happen to one of them the survivor would be very lonely. Ducks can get depressed and don't do well on their own if they are used to being in a flock.