NOTE: You have to install luma first in order to configure it. One way to do that is "NTRBoot": https://www.youtube.com/playlist?list=PL1-LwCZ3SdPrB-fPSKbeA3aA0I0NYIIsz (a compatible DS flashcart is required).
Sorry for my accent :)
This video shows the remaining steps to kickstart with the custom firmware.
Links:
Guide to read: https://3ds.hacks.guide/finalizing-setup
Homebrew Launcher: https://github.com/fincs/new-hbmenu/releases/latest
GodMode9: https://github.com/d0k3/GodMode9/releases/tag/v1.9.2pre1
FBI: https://github.com/Steveice10/FBI/releases/latest
ctr-no-timeoffset: https://github.com/ihaveamac/ctr-no-timeoffset/releases/latest
Anemone3DS: https://github.com/astronautlevel2/Anemone3DS/releases/latest
Checkpoint: https://github.com/FlagBrew/Checkpoint/releases/latest
Homebrew Launcher Wrapper: https://github.com/mariohackandglitch/homebrew_launcher_dummy/releases/latest
DSP1: https://github.com/zoogie/DSP1/releases/latest
Luma3DS updater: https://github.com/KunoichiZ/lumaupdate/releases/latest
