Hi @thomaz, and welcome to the OFN community! Great to read your journey and your will to get an OFN Brazil instance up and running 
Ping @edushima, Eduardo is also based in Brazil, and contacted us some time ago, I don’t know where you are at Eduardo at the moment 
Anyway, about how to start a new instance, you have various threads on the topic, and I recommend you to look at this one: Running your own local OFN and then you can follow the linked topics. This one can also be interesting for you: How to get your local OFN platform up and running?
For the technical side, you can find information on GitHub, there is a wiki with technical documentation there: https://github.com/openfoodfoundation/openfoodnetwork/wiki
For the translation, I see that you started the Portuguese language on Transifex here: https://www.transifex.com/open-food-foundation/open-food-network/
If you want we can plan a skype conversation, so that I can try to answer your questions! We also have monthly global community hangouts, where we discuss between instances about some common challenges, questions, decisions to take, and we also share updates. If you want to join, the next one is this Tuesday (at 12:00 GMT), let me know and I will invite you.
I’m looking forward to meeting you virtually soon!