A movie is a bad idea for a first date: you can't talk & you can't sit face-to-face. Choose some other event, such as a school baseball game, coffee after school, dinner out..... and invite her to join you. Do NOT ask a girl to "go out sometime". That gets you nothing. Example: "I've got 2 tickets to the ball game on Saturday & I hate to go alone. The first pitch is at 1; should I pick you up at Noon, or 12:30?"