Timer and Countdown?

Getting Started Newbie Questions
#1

How would I make a countdown timer with timer.* ? I know it’s possible, since there’s the app Minu and everything.

So how could I do it, and set some text to show the timer?

#2

Perhaps starting here:
 

http://forums.coronalabs.com/topic/32893-timer-countdown-update/

#3

Perhaps starting here:
 

http://forums.coronalabs.com/topic/32893-timer-countdown-update/