Hi Virgie. You should come over to pick an NGO you wanna work for or to know the procedures to create an NGO. About the visa you should apply first for a holiday visa then you can apply for a work visa once you create or work for a local NGO because it takes too long. I don't know if you will reply to this but if you are still interested i can talk to my american friend who has a business here so he must know about taxes, visas, and real estate.
Cheers