Start with a concrete want
A wish such as 'be happy' is difficult to turn into a scene. A goal such as 'return a borrowed bicycle before its owner leaves' gives your character an action. Ask why this matters to this particular person.
Add an obstacle and stakes
An obstacle blocks the goal. Stakes explain what could be lost. A damaged bicycle is an obstacle; losing a friend's trust is a stake. Small, personal consequences can carry a story just as well as a large disaster.
Leave room for a choice
A useful story premise creates competing needs. Your character might want to hide a mistake and also keep a friendship. When both are difficult to achieve, the character must make a revealing choice.
See it in practice
Starting point
Mira was a girl who lived in a town. One day something interesting happened.
Using this skill
Mira had twenty minutes to return her friend's bicycle. Its front wheel was bent, and her friend was waiting to ride it to an interview.
The opening gives Mira a goal, a deadline, an obstacle, and a reason the damage matters. It invites a decision about what she will do next.