Encyclopedia of Ancient Mesoamerica by 
They Saw the Future by 
Mesoamerican Myths by Guggenheim: Aztec Ancestors - Looks at masks of Mesoamerican peoples.
Mesoamerica - The Foundation for the Advancement of Mesoamerican Studies, Inc. takes a fairly encyclopedic approach to information about Mesoamerican peoples. Clickable entries abound.
Mesoamerica Timeline - A timeline with many clickable entries created by the Ancient History Encyclopedia, a well-established and well-respected website.
In Search of the Lost Empire of the Maya - National Geographic article that looks at the ancient city of Holmul.
Repeated Reinventions - Khan Academy article about Mesoamerica.
Use NoodleTools to keep track of your resources. You will be need to be creative with your search terms. If you are finding too few results, think of synonyms or related terms. If you are finding too many results, think of how you might add or take away words to limit your results. Remember to take the time to read what you're referencing and to think about what you're reading: does it seem plausible; does it seem well researched; what are some examples of faked discoveries throughout history and how did those shape our current thinking?