Where can I find resources on how to be a good supervisor?
There are three sources that I would look into.

Internal: you got a PhD and had fellow students share their experiences. What worked for you? What didn't? Advising is a very personal process so I think it's wise to make it your own.

Departmental: what are the advising norms in your department? Do you have a department mentor, or does the university offer workshops to new faculty? If so - attend them. They are invaluable for you to understand how your university perceives the advisory role, which may be different from place to place.

External resources: there are several online resources, I personally found this piece by The Professor is In here useful; this Science article is also very useful. TL;DR: be consistent, honest (for better and worse), supportive and attentive.


Good luck!