Nice to meet you here. Your mother tongue is Portuguese, isn't it? Unfortunately, yours and mine, Japanese, have just shut off. That's why I landed here too.
Like you, I am a re-starter after a 6-year blank. In my life, I have been in a bad cycle of shorter serious lesson and longer sleep. I have started this January. I have gained back so-so. The least I may say is;
First, as most of moderators recommend, find a good friendly teacher
Second, visual aids by DVD or YouTube to see and check various styles and fingerings
Third, become friends with good real or virtual fellows
Forth, use good resources, for instance, score and DVD libraries here.
Fifth, lone and tough self-study
(1) is too late for me and also I am not affordable. I try to follow the rest. Especially, (3) encourages me greatly.
Hasta la vista