I like to focus on the concept of “motion point”. This is the point where as you lift up on the clutch petal the car just barely starts to move. I like to see the student get used to lifting the clutch petal feel the car start to move and then depress the clutch and either coast to a stop or apply the brake to stop.
Once we’ve done the motion point exercise a few times then the next step is to find the motion point and hold the clutch at that point and let the car reach a gentle rolling speed, then depress the clutch and stop. The rolling speed of 5 mph is good to start then you allow the student to increase the speed a bit each time they repeat the exercise. At some point the car will be going about 15 mph and you can tell the student to release the clutch fully and voila you are moving along in 1st gear.
Once the student understands and masters the “motion point” of the clutch the rest of the learning process go pretty smoothly.