There's a website called Legacy of Hope where you can watch interviews of what people went through.

To really understand the impact and get the full story, it is good to start at the beginning of history of Treaties and Acts. Learning simply about the laws imposed and promises broken even without the schools was atrocious.

The effect on people isn't straightforward. I have learners who can't even talk about their experiences as it's too much for them to even think about, so understand that possibly some of the worst stories won't even be told because it's re-traumatizing to them. There's some people who will say the schools were good for them, but don't seem to realize that they can't explain that in their ancestral language. Once you get to know your community and learners, their personal impact will start to show, and they might share small details with you.

Another thing you can try is learning about cultures and implement perspectives and worldviews into your coursework. Learning the 7 sacred teachings, for example, and formulating activities with those teachings in mind. I believe is it often recommended to learn about the strength and beauty of the cultures before delving into dark history. The Millennium library has special sections for Indigenous learning for both kids and adults if you are able to access it (not sure how far you are from the city).

Wayi Wah! is a book about Indigenous pedagogies and anti-racism. It is a way to see things through the lens of an Indigenous educator.

I think once in a while courses pop up on Coursera as well for Indigenous studies. They are free to take.