One set of progressions I've picked up that has helped me to teach building out of the back is as follows:

Unopposed circulation patterns with backline and holding mid(s)
- cones set out to show the players EXACTLY where they should be
- unopposed patterns should be used consistently, but you can add in small variations, or reduce the amount of time you spend on them
Backline and holding mid(s) start in offensive spacing vs. light pressure
- to encourage good spacing, backline and holding mid(s) dribble into small goals to 'score'
  - backline must connect a set number of passes first. I usually start with 5.
- offensive players can finish on a goal with or without a GK
Ramp up the number of players pressuring as the backline improves, until the numbers look game-realistic
Have the backline start in defensive spacing (closer together) to force them to expand
Have the offensive players start with the ball to force them to win the ball, expand under pressure, and then build out

This has been a fairly robust formula for me, but the real trick is to figure out when to add in another element, or even take a step back to review. I've also tried to find the best time to add in the goalkeeper.