As a youthful, teen-like, girl-worshiping-idiot. Here's my advice.
Befriend her, get comfortable around each other, and have a good time. Don't just try to ask her. Once you're comfortable with each other, hint a little (teeny tiny) bit. If you get some positive signs, you're golden. Now at this point, where you know she likes you, and you like her, and you're both super awkward and giggly, the worst possible thing you could ever do is put off asking her out. Just commit to it. go for it. Ask her. MAKE SURE you ask her out in a timely manner, because you'll find yourself in the friend zone pretty quick otherwise.
good luck man!