Hey Marcelo, just like you, I'm from Brazil and I had a lot of trouble figuring out "how to start transitioning for real", since everything seems so unreachable over here. You won't find any sort of vest designed specifically for binding, you'll probably struggle a lot to find soft packers, and whenever you find other transpeople you could relate to, most often they will be unaware of FTMs. We are that invisible.
But, hey, it's not all that bad. Some time ago,
a fellow FTM from Rio changed his name legally without having to undergo genital reconstruction surgery. That's because, in our case, no amount of money can get us a perfectly functional penis - you can't be forced to do something you may not want to to your body just to get a name change. So, yeah, think positively and take one step at a time.
About the binder: if you have access to an international credit card, you can always import binders from
Underworks. I've done that before and even if you end up being charged taxes, you won't pay much, since they declare each item worth only around $6. It's worth it, but exchanging isn't viable, so I recommend making sure you order the right size. If you can't import, there are post-op compression vests that you could wear for the same effect. Those tend to wear out faster, though, and depending on how big you are, they won't do much for you. If you happen to live in São Paulo, anything seems to be easier to find, and somewhat cheaper as well.
I also highly recommend visiting a therapist who's used to dealing with transgender stuff. Even if you don't give a crap about therapy (though you should), you'll need someone with some reputation if you want prescriptions for hormones and a mastectomy. At that point you should have already lived as a man (it doesn't have to be full time) for an year or two, to make sure you really want to transition. You can't just decide to take T shots and get away with it because you always knew, even if you've been on therapy for some other reason for a long time - I'm talking from experience here

Other than that, be prepared to face a lot of awkward situations. When getting a haircut, if you're read as female -, despite the fact that you'll end up paying more even if you get a mens hairstyle - you should make SURE the hairdresser knows what you want. Say out loud and clear that you want a masculine haircut. Even if you go for something sort of "androgynous", keep in mind that most hairdressers will try to feminize the cut if they think you're just a butch girl.
I only registered on Susan's to reply to this thread. I wanted to send you a personal message, but I couldn't, so... in case you need a few more tips on how to get around in Brazil, send me an e-mail
My English sucks, but I speak Portuguese, so it's all good, and it's not my personal e-mail, so it's okay to leave it here, I guess
Edited out email address - I've PMed them for you. - Nicki