Trigger help

Trigger help

I need some help with triggers.

1.Can someone tell me how to use triggers to make it so when someone says "-save" it will save their character and also how to load the character.
2.I also need to know how to attach stuff to units.
3.Last I need to know how to make a quest complete if you kill all monsters in a certain rect.

1: WEUnlimited save code
2: The use of special effects, or the sphere and orb abilities to attach them to things like hand, right, hand left, etc
3: Using the "Number of units in region matching (player). Neutral Hostile for creeps