for a U.S. citizen what document do I need to get married in brazil to my fiance that lives in brazil?

we wanted to get married in italy but no one know how a brazilian citizen can get married in italy so now we are back to square one with me going to brazil to married him there so I can come back and start the paper work to get him back to the U.S. which I know there is no guarantees for that but it a risk to try and hope that it works so I'm trying to find information for me to getting married in brazil I already have my passport and I have the long version birth certificate with my parents name on it so I don't know what I need to allow me to married him there it's going to be a civil marriage not religious it too complicated and too long of a process for religious. so any information will be helpful