Tutorial for quest

I need a litlle tutorial to do a quest.
For exemple i want that the hero help a bandit team to destroy a village
And that the quete is completed if all the village is destroyed.

What sould be the triggers ??

plz help me

First trigger:
Quest - Create Quest
Create a "Required" quest titled "Help the Bandit" with the description "help the bandit destroy the village" using icon "ReplaceableTextures\CommandButtons\BTNDeathPact.blp"

Then for detail:
Quest - Flash Quest Dialog Button

Then:
Quest - Quest Message
Display "Quest log updated"

Lastly and most important:
Create a Variable title destroyvillage and have it a quest with no initial value. Then do the action trigger "Set Variable". Do Set destroyvillage = last created quest


Then to make the quest as complete:
Quest - Mark Quest as complete
Set "destroyvillage" as "Complete"