Need Giveaway Advice

[Avabelle]

I'm doing my first giveaway using rafflecopter.

I am giving away a $100 gift card from Amazon. I trying to grow my facebook page.

I am from Canada - should I hold the contest so that it is open to Canada and US only?

Can I do this from Canada? And do I send the email gift card from Amazon.ca or Amazon.com?

Thanks in advance!