Spin effects are pretty much intuitive (left or right) until you get into multiple, randomly frozen balls. I recall guys showing me dead balls in a full rack and some of the ground covered was the results of push spinning a line of balls - how you got action on balls other than the first one. Effects like these go all the way to the break itself although far more subtly at break speeds. Suffice it to say for now that spin experimentation should include push combinations and multiple balls.
Back to the left right of it, the main issue I find is keeping spin, speed, and accuracy from interfering with each other. There's your journey of a million balls right there. At that stage, independent throttling of the effects is everything. Left right indeed...