Hello!
I feel you about not having a lot of time. First off, let me point you to the Into The Odd Syllabus. I try to keep it up to date, so if it isn't please let me know!
Now, as far as maximizing understanding within a limited time.
- Chris produced a wonderful podcast series with the release of EB. It does a good job of "deep diving" how the setting and mechanics work together.
- Chris ran an actual play for the creators of Mothership RPG. Also available on the podcast.
- This series of building Bastion boroughs, Deep Country, the Underground, etc.
- Join the ItO Discord and ASK QUESTIONS. We love to help.