I wanna ask out this girl?

except im not out of the closet yet:( and i have no intention of coming out any time soon. but theres this girl and shes really pretty and ive never talked to her before in my life. so i wanna get to know her before i ask her out, but i dont want to just go up to her and be like hey whats up cause thats weird and creepy ha. so how should i go about thiss ?