I agree that there is no "RIGHT" way to write, but too many amateur scripts show exactly that the writer didn't do his "homework."

I've had to study Sarin gas, Economics majors, maps of various cities and countries, Greek history, the FBI, SEAL team, and oh yeah, vampire lore.

Research is my back story. Rather than looking for a "childhood" memory I look at the job, lifestyle of the person and find conflict there.

For example, most cops become cops for the same reason but their personalities determine how they treat victims and civilians - no matter their past. Batman has more reason to kill criminals than anyone but his "moral code" prevents it. That's much more conflict.