Start with a few substantial books rather than a long shelf.
For lectures and video, use Faculty of Classics, University of Oxford, Classics for All, Center for Hellenic Studies, World History Encyclopedia. Watch with a notebook: write down one claim, one piece of evidence and one question after each video.
For audio learning, The Ancients, Ancient Greece Declassified, Let's Talk About Myths, Baby! give accessible routes into ancient history, Greek culture and myth reception. Podcasts are useful for breadth, but they should lead to a text, object or essay question you can discuss precisely.
For structured study, Greek and Roman Mythology, Getting started on classical Latin, The Ancient Greek Hero, Roman Architecture give routes into mythology, beginner Latin, Greek epic and Roman material culture. Applicants without school Latin or Greek should treat language study as evidence of commitment, not as a requirement to reach advanced fluency before applying.