Congrats on the little one. I have two of my own. My son is 6, and I am taking him for the first time this year. Just to watch and learn.
Don't expect to be shooting all the time when duck hunting. I have spent many a days in the field not firing a shot. That is not necessarily the norm though. One thing to know is don't pick up and leave too early. We have had many hunts where we didn't fire a shot all day, and in the last hour to two of shooting time, we limited out. Be prepared to move to where the birds are working if you aren't in an area where MDC has told you where you can be. Even at the duck parks, you may need to move around in the pool, adjust your spread, walk thru the decoys to kick up the mud. Motion in the decoy is very helpful. Get a jerk cord, or kick the water. Duck hunting is a lot of trial and error until you build up the experience to read the weather and the way the ducks are working. You may slaughter them one day in a spot, and not see a single one the next. Alot of it depends on timing, the weather, and your experience with adjusting to the conditions. Scout. Scout. Scout. See how the birds are using the area, how big of groups they are sitting in. Calling less later in the season. Change the species in your decoy spread to match the species in the area if you have that luxury of having multiple species of decoys. Being in a flooded corn field vs. flooded timber on overcast vs. sunny days. etc..... The list goes on and on, and it will take years of hunting to learn. I have been hunting 20 years and still learn something new every year.
One last thing, in my experience I have had the best hunts on cold rainy nasty days. Not to say I haven't had good hunts on nice days, but the nastier, the better in my opinion.