To make the computer talk to you, all you need to do is create a speech device:
make voice speech device
make message string
Then just set the message and tell it to "speak"
when start
.set message to "hello world"
.tell voice to "speak"
.wait 3 secs
It's that easy! It'll read out any text you like, so to make it count:
make counter number
when start
.set counter to 1
.repeat 10
..set message to [counter]
..tell voice to "speak"
..change counter by 1
..wait 1 secs
That's pretty much all there is to it!