@YutongTie-MSFT thank you for getting back!
I couldn't really find a detailed tutorial for deploying using the studio, but (as this implies) the wizard was pretty straightforward. I also used the entry script from here for testing. Once it started giving me errors, I started searching other documentation, including trying to do it using the CLI and ARM templates, copies from the studio. This successfully deployed once, but I wasn't able to replicate it (a lot more BadRequest errors and missing assets, etc. - I'm still learning to use the CLI, etc.).
Regarding region, I'm using West US, as it's for testing.
Thank you again,
David