Don't go with an inflatable canoe they really suck and you can pick up a decent used canoe for way less that 500. Especially if you have kids and the lures get all over the place it can get messy.
Maintenance is pretty easy, cover it up in winter and give it a wash in the spring. They don't take much to look after just don't let it fill with water and rot turn it over.
Make sure it has a keel and isn't a flat bottom. Those flat bottoms are not as steady in water and a nice steady canoe when fishing is a must.
As for the canoes weight the light ones are great if you plan to portage but if it's a little heavier you feel safer and the wind isn't as big of a problem and you can put a trolling motor on the side of a sturdy canoe. I
Those plastic monsters you see in Canadian tire stay far away from there too heavy and slow.
Fiberglass single keel and don't use those stupid seats they might help your back but not your stability.
Last thing is don't get sold on those sails either, we got one to try out on a portage trip and it was pointless.
You should not be going on the water in a canoe with your kids in Algonquin at this time of year when your new to the game. Play it safe and wait till next year.
I always found right before a storm was the best time to get out. That heavy air just before a storm. When it rains lightly like last Friday I had a great day 3 pike 2 Walley 4 small mouth all nice fish. If it rains too heavy the water can become discolored and then I find the fishing goes quiet for a day.