Sounds like you have the fishing basics down.
I'm not sure how old your kids are, but my younger guys certainly create a different challenge when I'm out on the big lake setting up for salmon.
A few things I try to do is keep everything as simple as you can, take only what you need and have everything as organized as possible before hitting the water. This includes having the rods ready and lures picked ready to set up. It's amazing how small a boat becomes with a couple of kids in there.
I find it best to have my wife and kids steer while you are setting up. I get out in the open and give them a point on land somewhere to aim for as they don't seem to grasp following a contour line or previous path on the chart plotter. Normal fishing set up does not apply now. Way more patience and time is needed with a 9' rod with an 8' dipsy, flasher and fly combo when they are right in there "helping" you out.
I take one small cooler with drinks and snacks for the kids. Drink boxes work good and any food that doesn't fall apart easy like granola bars. Again, keep it simple. Mine can add enough complications all on their own by times.
Lastly, and depending on your kids again, I find after a while of trolling and not catching something they tend to get bored. After spending all that time getting out there and setting up, the last thing you'll want to do is go back half an hour later. Try to bring something that will entertain them for a few hours in between. My cell phone games have saved a few trips of going in earlier than I wanted. As a guy said in another thread said, "dad's boring salmon trip"
I think he knows what I know.
I hope that helps a bit. Good luck out there and look forward to hearing how things went. In a good way.