well depends on what you want to trigger it, timer, something getting shot....on what ever it is go to outputs on what ever, trigger it to explode. walla
i believe so, Leo. i was looking at this for another posters q's. check the entity named 'logic_auto'. there is an output named 'OnMapSpawn'
I'm not sure, but I think that the map "spawns" every time a CSS round starts.