For sonoff this topic is a good starting Point:
You should find everything you need there (most needed information all in the first post i think).
If there is something missing after that, feel free to add a specific question over there. 
For sonoff this topic is a good starting Point:
You should find everything you need there (most needed information all in the first post i think).
If there is something missing after that, feel free to add a specific question over there.