AutoIt code won't start

you need to call the function, I've added a hotkey to your code so you can call the func with F10

Code:

#include "ImageSearch.au3"

HotKeySet("{F10}","Start")

$X = 0
$Y = 0

Func Start()
   $Search = _ImageSearch('mc1.bmp', 0, $X, $Y, 0)  
   If $Search = 1 Then
      MouseMove($X, $Y, 1)
      MouseClick("left")
   EndIf 
   
   $Search = _ImageSearch('mc2.bmp', 0, $X, $Y, 0)  
   If $Search = 1 Then
      MouseMove($X, $Y, 1)
      MouseClick("left")
   EndIf 
   
   $Search = _ImageSearch('mc3.bmp', 0, $X, $Y, 0)  
   If $Search = 1 Then
      MouseMove($X, $Y, 1)
      MouseClick("left")
   EndIf 
EndFunc

while 1
   sleep(100)
WEnd