First Grow!!! 45 days into flower!!! Possible Yield???

This is my first grow of 3 Fem Pure Power Plants, 1 Doce Vita from Dutch Passion ans 1 Arjans Strawberry Haze from Greenhouse. The 3 Power plants are standing at 3 ft. tall. The Dolce Vita is standing at 4 ft tall and THe strawberry haze is at about 2.5 ft. Im just a little curious as to what some people here think of theese and what my expected yield should be around or how theese beutiful ladies look from an experianced growers point of view? Also when does flowering actually start, Does it start from the same day you switch your light to 12/12 or does it begin afterwards once the plant realizes it is time to flower (1 week after the light cycle has been changed)?

First off... pictures?

And once the 12/12 starts enzyme thingers in the plant will trigger flowering.. or something like that.

Annnnnnd

soil? hydro?

lights?

nutes?

it is hard to tell without specs... especially without pics