Integration of Tellstick Duo/Nexa switch in HA

I’m planning to switch from Homey to Home Assistant. As I’m away from my home and don’t have many devices to test with. At home I’m using mostly Z-wave devices but at my present location, I only have a Tellstick Duo and a Nexa switch.
So far I have bought a Raspberry Pi 4 and installed HA on it. Also, I have installed the Add-On for Studio Code Server and Tellstick in the web interface and added the following in configuration.yaml:

tellstick:
host: core-tellstick
port: [50800, 50801]

But I cannot find out how to go from here.
Will all remaining configuration be done in configuration.yaml? Example please.

P.S.
I have connected the Telldus Duo and the switch in TelldusCenter in Windows and it works fine there.