help with double effect abillity

[talshiboli]

HI guys,fairly new to this edditing thing,havent got any knowldge in JASS and only basic knowledge in triggers so I try to stick with modifying abilities but i doubt I can this time.
the concept for the ability is this : create 3 units to draw enemy fire (the units cant damage others and ide like them to have spell imunity and maybe farsight)
and become invisible for a short while

if anyone has an idea for how to do this pls help (you can mail me if you prefer)

 

[deathismyfriend]

immunity and damage would be done in the object editor.
u would need to use the spell called Channel for this and trigger it urself.
first u create 3 units at position of the target point and put the unit into a tempUnit variable thats an array. so tempUnit[1] = unit
tempUnit[2] = next unit and then the third one is tempUnit[3] = final unit
next u add all units in range to a tempUnitGroup.
then u pick all units in the group and do actions
in the group loop u need to set tempInt = random number between 1 and 3.
then u order the picked unit to attack tempUnit[ tempInt]
and that should work the way u want it to. if this is an instant spell it will be fine like this but if u want to keep ordering those units to attack the 3 units u created then u would have to make this MUI with a loop to check who the units are attacking.( look at the chapter how to index in my tutorial in my sig).