I would recommend to simply get started and experiment - that’s the joy of any project. You can search the forum for related topics or even Youtube, as there is a lot of great content on n8n.
You can also have a look in our workflow template collection to search for user implementations for specific nodes:
Thanks a lot Ria,
I have already create a flow that answer at calls from Home Assistant.
HASS > Webhook (OpenAI API like) > AI Agent > Ollama LAN server.
Now I work on the domotic actions… in order to create an OpenAi interface that send the actions to my Home Assistant.