This is a good guide on hacking the switch.
https://switch.homebrew.guide/
Also, VERY important to make sure that your delete the wifi settings and place the switch in flight mode BEFORE creating the emunand. (just remove all the wifi settings info before attempting the hack)
That way the emunand will not try to connect to the internet to nintendo's servers and get you banned,
Keep sysnand clean and you can play online