I live in Canada, If nobody is there to sign for my package what happens to it?

I'd suggest contacting the Apple store to make sure, but in the US you can pre-sign or, as another option, choose to pick up your order at a store.

In the us at least, the carrier will try three times. You get a note on the door each time. With ups, I saw you could add delivery options on their web site. I suggest you call the carrier with you delivery number code.

R