You'll be fine! Lake Ontario is fairly predictable. Get some wind and weather apps for your phone and keep an eye on them when you are planning to go out.
You're at the West end of the lake, so the prevailing West winds will have little waves. Easterly winds on the other have the whole 100 miles of the lake to build up waves from. Not a big deal once you get some experience though.
Since you own the boat you are learning on, I think the best idea would be to hire an instructor to give you a few on-boat lessons. Should be some near you.
You'll need a VHF license as well.
After a while, you'll have enough confidence to do a lake crossing to Toronto. 4-5 hours under sail. And then you can enjoy the stress of docking at new to you marina