There is no Canadian accent, really. It’s just a few regional accents (as others have pointed out). Come to think of it, I can currently only think of the “maritime” accent, and “rest of Canada” accent (which is a generic “american” accent); in addition to the Québec accent (but that doesn’t really pertain to this topic, does it?).
I, for one, am a Canadian who does no use “eh” and does not pronounce it “aboot”. In fact, one of my pet peeves is people even joking about either of those terms. It annoying, not funny.
If I wanted to fake an “American” accent, I’d go for either a Texan accent or a very strong New York accent.
I can’t really give you any tips on what a “Canadian accent” is, unfortunately (“Just speak normally.”). Maybe someone else can help you.