Legion TD like Map

[TremplerKing]

It would be awesome if someone could help me or show me how to a map like legion td. I´m really new to warcraft and designed a little map but now the script is my problem i did a little TD before but there is some stuff in Legion TD that is wired, like the towers, they are units and can move when round starts and other stuff like that.
There is no source of Legion Td and its sad :/ it is a awesome map !
Maybe someone could help me on that... or write a tutorial so more mappers could do it.