What happens next?

How to ask a girl out if you're a shy boy (pre tweens )
Make eye contact and smile.
Making eye contact with the girl is a form of talking to her without actually speaking. If you can get her attention and look her in the eye, it'll let her know that you notice her.
Follow it up with a smile so that she knows that you like her. Pay attention to how she reacts to you making eye contact and smiling.