To be successful, this step must be absolutely consistent. The most important thing in developing a consistent motion is to remember that the more complex and longer the motion, the more variables are involve. The pitcher must deal with enough variables without having to worry about the delivery. The best delivery should end up with the pitcher in a balanced position. This not only puts less strain on the body, but permits quicker reaction to a ball hit back up the middle.
Every pitcher is different.
What is written here is just a guide. Use what feels best for you. Always be open to suggestions and willing to learn. Pitchers constantly exchange tips at tournaments. Some ideas you might try immediately and some ideas are better left for attempting in less competitive situations.