the map editor is 3rd party software not created by blizzard(it is in the oppening disclamer)thus it is not supported by blizzard, and the map editor is the ish. the triggers are very simple just need to play with them alot. maybe you should try and write psuedo code before you make the triggers it makes "codeing"alot easier, by psuedo code i mean written code on papper.. say you want a creep to attack or something.
create creep, move creep to attack, "IF" creep dies make another.
that is psuedo code.
and if you look in triggers it is all there and easier to find if you know what you are looking for compared to the psuedo code.