Legois,
Japanese black pines grow easily over here , Trinidad [ next to Venezuela ] try a seedling and around winter time for you, see if you can lower the temperature to 20 deg.c for 12 to 18 hours. For about 3 months.
You can probably do this easily if you have a window with sun, and just let what happens in winter time in Brazil.
No need for frost, just slightly weaker light and a lower temperature for the day.
We still reach 30 deg.C but only for an hour or less during the Northern winter months.
You can also start off with seeds. Remember to keep the air moving for any of your bonsai attempts.
Read here -
http://www.bonsaihunk.us/index.html
Good Day.
Anthony