I have no experience of Argentina, apart from a long-ago girlfriend.
But I would sound a warning. Your CELTA certificate won't amount to much, in my opinion. It's a ridiculously short course, trying to cover an enormous subject. I'm not impressed by colleges offering their very expensive courses to young people with the promise that, with this certificate or that, they'll have a passport to a great life anywhere in the world. Remember that these colleges are businesses and their literature is commonly called 'advertising'.
With that rant over, I'd encourage you to go ahead and enter a new world, but understand that to teach well involves a lot of hard work, preparation, frustration and late nights - working up the next day's lessons, not dancing in the club. As you know, it's not well paid anywhere and you may be badly exploited in some places, so don't complain when it happens, because it's your choice and your eyes are open.
Nonetheless, such a career can be very rewarding indeed and lead you to some wonderful places and people all over the world. I hope that you actually like teaching, because that, for me, is more important than anything.
- For Teachers