question

Create an array that will be used hold the handle to each sound

Dim Sound(8)

then load each sound into one of the array elements

For iter = 1 to 8
  Sound(iter) = LoadSound("sound" + iter + ".ogg") ;sound1.ogg, sound2.ogg, etc.
Next

then when you want a sound to play, use a Random statement to select one of the sounds

PlaySound(Sound(Rand(1, 8)))