Winter clothes and shoes ?

Br

So I’m planning a trip to Canada in December and I live in the Caribbean and I’ve never traveled anywhere that gets snow so I’m a little lost on what types of jackets would be ideal for that kind of weather. Are parkas ok? And types of shoes as well. Ofcourse I have boots but they’re not fit for snow. I don’t want to fall and injure myself. Do you recommend any online clothing stores that I can order stuff from? I don’t want to spend too much because it’ll probably be years before I wear them again.