I checked for shipping to Brazil-- a problematical destination*-- and I suspect your first customer will be somewhere overseas.
If you need guidance, just ask.
But basically, AIR MAIL only and don't be embarrassed to use and charge for tracked service.
This is for your protection.
If your customer wants to cancel because the shipping is too high-- let him. At this point, it will go better. We can guide you about how to do this.
I would suggest that until you have your DSRs showing and you are no longer having your customers' payments Held by Paypal, that you restrict shipping to Canada and the USA.
*The people are fine. It's the customs and the postal systems.