1. The foot not kicking the ball should be planted alongside the ball at the time of impact.
2. The hips and shoulder should be square to the player receiving the pass. An easy explanation for younger players is to have their belly button pointing at their target.
3. The kicking foot should be turned out and the ball struck with the inside of the foot.
4. The kicking leg should follow through towards the target.

For younger players, you will need to emphasize that the receiving player will be more able to trap the ball if it remains on or near the ground. It is also important that players can do this with both left and right feet, and with both the inside and outside of the foot.
The most common errors resulting in inaccurate passes are:

Bad placement of the non-kicking foot.

Hips, shoulders, and bellybutton not square to target.

Not keeping the ankle and foot stiff through impact.

Not following through to the target.