How to add these triggers in map editor?

I'm having some trouble with a few things in the map editor. Here are a few questions about triggers, if anyone knows the answers.

​

1. How do I make any of the civilization's population and all of the buildings destroyed upon defeat or resign?
2. How do I automatically spawn any unit by its self? (from a castle for an example)
3. Can I restrict building certain buildings in certain areas? (without adding buildings to the disabled buildings list)