Hi, I am new to Flyer Talk, but have already gained a heap of information!!

I am headed to the USA and Canada later in the year. I have never done a huge trip like this on my own, so I am a little worried about the whole visa thing. I am going to the USA for exchange, so I have my student visa, and then I also have a travel visa for travelling around after.

I am heading from Seattle to Vancouver on an Amtrak train, and then back to Seattle. I was wondering if anyone could help with what I need to get across the border into Canada? I am Australian.

Also, what do I need to get back into the USA?

I will be doing another short trip to Canada after, from Chicago to Toronto. From Toronto I will be heading to Washington DC. I assume the process for the second trip will be the same as the first.

Thanks so much in advance to anyone that helps!