Any pointers on getting started?

I was fascinated by the Amiga when I was young, but they weren't widely available in my country.

Lately I've had an itch to do some retro programming work and was looking at the Amiga specifically. I tried Aztec C natively in UAE and VBCC as a cross-compiler, and got some command-line and hello world Intuition programs working.

But going beyond that has proven somewhat difficult. Documentation seems to be scattered all over the internet. I found a bunch of books on archive.org, but they mostly seem to focus on Intuition applications or beginner programmers.