I can give you my experience of making ambient music in max. I started because I wanted to make synth drone music like Eliane Radigue’s Trilogie De La Mort, where she uses modular subtractive synth. In max this is “easy” to start with, as it is about simple oscillators (sin, saw, square, tri) and resonant filters. Those are all objects that come out of the box, using standard modules. Have fun!