I am not sure if the Aztecs or the Mayans did spells and all.
As far the Aztecs go they did rituals and ceremonies to please their gods. If they did not do sacrifices they would fear the worst. They seem to have a obscure mythology, and culture but if you did enough research I am sure they won't be that obscure to you anymore. Research is vital, and I am sure nobody will be spoon-feeding information anywhere. So the best bet is researching if you want to know something, and among all using "so called common sense".
sources : http://www.class.uh.edu/courses/engl3396/jtchris2/gods.htm