How do I tell a girl I have a crush on her (I'm also a girl)?

Theirs a new girl in school. She is pretty and sweet and nice. I have never felt this way about a girl before and I want to get to know her more. How is a good way of asking her out. I don't want her to be weirded out by me about liking her.
Update: Dont tell me not to ask her cause chances are really good I'm going to do it. I just dont want to make an idiot of myself
Update 2: So I invited her out for coffee after school. We sat there for like an hour and a half just talking about school life and other things. On our way out she actually invited me out this Friday
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