Ive never really approached a girl. I'm in school and I see a few girls around. I'm sure they like me it's just finding out what to start with. I feel like once the conversation starts I can keep it going. I need something to start off with that doesn't seem weird. Simple as that.

If It's a group of girls you can just walk up to them "hey girls, what's going on?", ask their names, introduce yourself etc. you don't really need anything fancy. Body language, posture, tonality and confidence are way more important in that situation than the words you use.

There are loads of great stuff to read about these things, I learned a lot from this video with brad branson: http://www.youtube.com/watch?v=QS36bpEi1qI

hope this will help you

Thanks alot, here in the past month or so Ive been working on confidence tonality and eye contact. I have a higher sense of tonality now, I used to be really shy and I had someone told me to be me and not care about other peoples opinions and it has helped with becoming the alpha. I've changed a bit but I want to get to the point where I can just approach random people and feel comfortable.

My main question is what can I say to random people, specifically girls to start a conversation and not come off as weird.

I think talking to girls at a school is one of the easiest places to approach. since they're everywhere you just need a reason to talk to her. it could be as simple as asking for simple directions to start the conversation flowing. be perceptive of things she is carrying, books, etc and try to incorporate that, building further connections. i dont know about you by my school has a pub and its pretty packed most of the time, i like to simply ask her to grab a beer sometime if it feels good, then ask for the number. girls in school are looking for adventure and new experiences just like you, so you'll be suprised at how responsive and easy going they can be. but then again some arent haha say thanks and walk away to the next one

good luck bud, just be yourself and as keep it super simple

You can always use standard direct day game openers on the school yard, as the school yard is a day game environment. Here are some direct day game example videos, these are filmed in the street but it could easily be in a school yard:
Johnny Berba:
http://www.youtube.com/watch?v=MFmkPp2hVTk
Nick Hoss:
http://www.youtube.com/watch?v=U8vvFCCxwxw