Try This

Ok…you have your character be he a he or a she. Mine’s a he.
What is he doing? Where is he going? What mood is he in?
Then you have a place. Wher he is. What can he see, hear, smell? What is he thinking? How does what he is doing and his mood affect these things?
What happens?
How does he react to this? What does feel? How does he react? What does he do? What does he say?
Then what happens as a result?
How does he react to this? What does feel? How does he react? What does he do? What does he say?
THEN what happens?
…and so on.
What you have just done is to get in the skin of the character and enabled the reader to live the scene with that character.
Give it a go. Try it with your opening scene.