Non Lucrative Residence Permit

[Gio]

Hi,
I'm from Brazil, residing in Brazil.
By the Spanish Embassy website in Brazil the requirements for a Non Lucrative Residence Permit is relatively simple: they ask for medical clearance, police clearance and financial resources.
I've tried get more information but was fruitless. The embassy personnel told me to follow the web site.
I'm confused because I have seen different posts with other requirements.
I'm ready to move forward, but I want to be sure when submitting my documents.
I have s many questions, as follow:
- When I apply, that includes my wife and two children?
- What kind of financial proof? Bank statements? Property deeds?
- Born in Brazil, makes me eligible to the "two years residence" in order to get the citizenship?
- After one year of Non Lucrative Residence Permit, can I change my status to an Worker Permit that also leads to citizenship?
All the information and guidance will be very much appreciated.