On my understanding the nozzle diameter it is a balance between the growing speed (per layer) and the level of desired detail. Yes, I am a beginner and I am trying to figure out how to do the correct selection for building my first Prusa. Do you have any documentation about the best practices in order to select the best size according to the required application?.
Anyway the nozzle does not look as a interchangeable part without the rest of the hot end.
I read that it is better begin with the bigger one 0.5mm; and just after doing some good jobs with that, test the smaller ones 0.35mm and 0.25mm. And they say that it is more difficult start with the smaller ones. It sound obvious because it is easier melt through a bigger hole. But that it is not related with the printing goal itself.
I have also a similar doubt about of the diameter of the filament (3mm or 1.75mm) that implies to change the extruder kit also? How to select it?
Sorry for my English (it is not my first language)

1.75 is dearer here where I am and it's too easy to break the roll as it is soo thin. As for nozzle size I run a 0.5 one and get very nice prints from it

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Experimenting in 3D in New Zealand