Thanks again! I asked a lot of people about this and nobody could answer.
Well, I have permition to enter in Belgium from 14/07 to 14/10, and ask there for my other visa, once I would live there for a time.
I just don't know if I could travel to another country before going to Belgium. I mean, as a Brazilian, I would not need a visa to do so. I don't know if the fact of taking this VISA changes this.
Thanks a lot once more. I'm really gettin' crazy for not knowing this.