I'm writing a paper on the God Quetzalcoatl, how he was interpreted by the Olmec, Teotihuacan, Mayans, and Aztec, and then how he was represented in their art.
But finding reliable sources is actually kind of difficult. I wouldn't be asking for help if half the sites I went to weren't these weird conspiracy theorist sites. And on top of that, the sites that do seem legit tend to provide different stories.
Any ideas whatsoever?
Look at Academia.edu and Google Scholar for academic works. Academia.edu can be funky sometimes when you do searches, so it might be better to go to a search engine and enter "academia.edu + Quetzalcoatl" and see what pops up in the search results which are not people's names.
Reliable online sites for Mesoamerican studies include Mexicolore (more introductory) and FAMSI (more professional/academic). The Dumbarton Oaks library also has numerous parts of its collection and publications online, including Karl Taube's Olmec Art at Dumbarton Oaks, which may be a good place to start.