Next step is to wire up the internals. Pretty simple: A thermocouple in the kiln will feed a digital programmer, which will control a solid state relay that switches the power. All that is made easy by the fact that the controller will accept 220v power.
The magic is all inside the controller. The process I’m using requires a scheduled cure cycle. Stuff like “increase to 500 degrees over four hours, then hold for an hour, then increase to 800 degrees over two hours, then hold for two hours”, etc. The controller makes all that automatic.