Asking a girl out (for the first time)

M

So there's this girl a really like, she's a pretty good friend of mine, although we haven't known each other that long. We hang out at break times, share interests, and sing together. There has been some flirtingbetween us, as well as various unprovokes compliments on bothour parts, but I dont know in what way she meant those things. I'm planning on asking her out within the next month, but I've never been in a relationship before and would have no idea how to go about it, even if by some miracle she agrees. We are BOTH bisexual and 14 btw. Any ideas? Maybe on a date idea to suggest right off the bat?