Ken,

The key to entering a basic pattern spin is the straight and level stall past horizontal after which your desired rudder, elevator and aileron input is added depending upon the direction of the prevailing wind. To do this, forward flight momentum must stop to allow the nose of the airplane to fall past horizontal. Direction of spin is applied by rudder or rudder and aileron input along with up elevator (if spinning right side up) down elevator if spinning from inverted.

I believe the spin entry is different in IMAC, wherein the airplane's nose is not required to go past horizontal before entering the spin.

Steve