I'm originally from the Parry Sound area. Moved to the GTA...not directly in Toronto, but the surrounding areas in 1984. Spent 13 years in Brampton, then started to jump around a bit anywhere from Burlington to Port Perry.
I can't say that I ever bothered to try and hunt in southern Ontario since I didn't know anyone down there with land. Up around the Parry Sound area (1/2 way up the Eastern shore of Georgian Bay)It's about 3 hours north of Toronto There's ok hunting, but nothing like your used to. I went out for deer this year west of Edmonton, and I couldn't believe the numbers. I wouldn't have believed that there were still places in this country that you could look into a field and see 80 or more deer staring at you. You won't see that in Ontario...at least not on crown land. The farther north you go, the better the hunting (in my opinion anyway). There aren't any moose south of Barrie (an hour north of Toronto)...yes....a moose was spotted in Barrie a couple of years ago

There aren't many deer north of Sudbury (from what I've been told). The nice thing about hunting in between is you can go to the same area and hunt either, although the seasons don't overlap.
You have to put in your name for a draw on doe tags in specfic WMU's. Your bought license is good for bucks only.
Your bought moose license is good for calves only. You put in for a draw for bulls and cows.
You need a license to hunt pretty much everything and pretty much everything has a season...not like here...but the "small game license" covers quite a bit.
I haven't hunted ducks in decades, so I can't remember if there is a special waterfoul ticket you need.
In order to buy licenses, you need the "Outdoors Card"...pretty much the same thing as a WIN card here.
Buy a boat. Once you're in Georgian Bay you can explore countless inlets and bays. Some places are pretty fished out, but you can still find lots of nice spots if you go exploring. One thing though. Georgian Bay sits on the Canadian Shield....lots of black granite.....somewhat hard to see bottom sometimes. Granite doesn't give. You rake your prop over it, your prop will lose everytime

If you aren't familiar with an area or don't know where you are, GO SLOW

The other thing to remember about the Great Lakes. The weather doesn't usually go from dead calm to 70mph winds in 10 minutes...but....when it does blow hard out on the water, it can get pretty hairy in a boat, and home can be an awfully long way away. It's not the ocean, but if you point the average boat at open water, you and drive for a couple of days in a straight line. I've been caught out twice when I honestly didn't think we were going to make it back. Anyway, I'm rambling on. You've got a lot of exploring to do. You'll enjoy that part. Just stay away from the Toronto traffic....it's a killer

If you want to know anything specfic about areas north of Hwy 9, pm me, and I'll do what I can to answer your questions.