I'm a noob at this, first time doing it and so, sorry for this but what do you mean by entry point?
This is what I can tell you, I followed the guide of 3ds.guide to install homebrew (I didn't proceed after that since I just wanted homebrew), then I installed
JKSM.6-30-2016 which is the most recent I think (all I did was copy the 3 files inside the 3ds folder), after that tried to open Poke Moon with it and there, green screen.
I didn't do anything else besides this.
Thank you for taking your time to reply to me.