Hi Krista!
Nice to meet you and welcome.
I'm also from Ontario, Canada! I'm restarting my journey, but am down from 343 to 324. I changed my diet, but not drastically. I stopped drinking pop, I eat more veggies, I've been trying to eat more chicken. These are small changes and I'm seeing results.
I agree, don't restrict your calories. I find if I deprive myself, I binge eat and all my hard work for the day goes down the drain.
As for exercise, I would recommend lots of walking, swimming, and dancing, haha. I know aerobics isn't for everyone though, but it's a great burn! I don't know how correct I am on this, but I was told working on my core will help me lose weight. For example, doing ab crunches/exercises can help get rid of belly fat... or so I've been told.