zoff wrote:I installed Karl's arduino plug-in, what do I do next? .
What's that plugin for?
zoff wrote:Sorry to be such a noob at this but I would appreciate any advice.
What do you want to actually do?
If you want to control the Sonoff with Tasmota firmware using MQTT, you need to set up an MQTT Broker, the MQTT Connector plugin, and the MQTT Shims plugin.
Start here: https://github.com/FlyingDiver/Indigo-M ... uick-Start