I wanna tell this girl how i feel and take her out on a date?

i think you should ask her to hang out alone with you, just like to get coffee or something very casual that you could do with a friend. then talk to her and get to know her more and let her have a chance to get to know you more. then when the get together (it doesn't have to be a date) is over just ask if she wants to go to dinner, movie or whatever you plan to be the first date. i think she likes you so i'm sure she'd say yes. it won't jeopardize anything if you just act cool about it, like it could be a friend thing. if , when she says yes then on the date act like thats what it is, so she gets the hint and does the same=) good luck!