You must have some reason for wanting to set your story there, right? What is it? If you don't have a solid grasp of the geography, history and culture of a particular place, it's silly to attempt to use that place as the setting in a piece of writing. If you don't have enough information to bring your setting to life, then attempting to grind out an entire novel set there is probably not the wisest decision that you could make. Nobody who's familiar with the landscape, the peoples, their language and traditions is going to slog through hundreds of pages of inaccurate bunk.
When you say that you "can't seem to find much on it", are you referring to internet searches that are coming up empty, or are you saying that you've exhausted the stacks of your local library and watched a year's worth of nature documentaries on the region? I'm guessing it's the former. Just because you can't find what you need with the clicking of a few keys, that's no excuse to attempt to recruit other people to do your footwork for you. Talk to your local librarian. Speak with a history or geography teacher. Read books on anthropology and pre-Columbian South America. Just because a Google search doesn't provide you with heaps of information, that's no reason to outsource your research to strangers.
If you're still hitting a brick wall after that, which is very doubtful, then think about possibly shifting your story to another location.
Research is the foundation for writing an extended piece. Without a foundation, nothing will stand. Do your research.