Setup Nabu voice assistant

Hi All,

I am totally new with HA, I was able to integrate a couple of devices (Tuya, Samsung, Ezviz, Blink, Prosegur Alarm) and services (PirateWeather, Google, etc)
I was able to perform some automatization and no I am suscribed to HA Cloud but I dont know how to use the HA voice assistant.
Is it possibe to use a Google Nest to wake up HA voice assitant?
Also I downloaded Openwakeword but I dont see anything to setup, any wake word.

Thanks in advance!!