Luizinho,
being your neighbor (I'm from Brazil) let's tell what I read.
Aero & Cia, from Brazil. Good coverage on events in Brazil, mainly on the area south of Minas Gerais State.
RC Modeler Magazine
Model Airplane News
R/C Report
Model Aviation (as an AMA member)

Now, most of the magazines charges very high rates when mailed overseas. Therefore, if you need to choose one or two, I would recommend Aero & Cia, R/C Report and RC Modeler. I agree that the later has a log of ads, but the columns signed by Clarence Lee (Engine Clinic) and Don Lowe (Flying Lowe) are very good stuff. They have a new contributor now, Jerry Fiesta, who used to write for R/C Report. Jerry does a column dedicated to beginners, which in your case will be very useful.