First the student should be shown the warnings of an impending stall - speed low and decreasing, controls less effective, attitude becoming relatively nose high in level flight and then the onset of light buffet.
Then the student should be shown what happens if the warnings are ignored and a full stall develops - identified by increasing buffet, increasing rate of descent, possible wing drop and nose drop. But they should only see all the indications once as it must be made clear to them that henceforth they will recover either at the stall warning stage ('incipient') or the first identification of a fully developed stall.
The recovery is STANDARD:
FULL POWER and simultaneously move the control column centrally forward until an attitude is reached at which the identification ceases - then maintain that attitude.
Once the ac is unstalled, level the wings and recover from the descent - the rudder should only ever be used to keep the ball in the middle and NEVER to 'pick up a wing' or other such thing!
Only when the clean, fully developed stall and standard stall recovery with minimum loss of height has been mastered by the student should other areas of stalling be taught.