@OwenXx,
Like @Krumple said, have conversations. And talk to a lot of people. Volume really is the best way to go about this. Consider it practice if nothing else. That is, be kind and attentive to pretty much everyone. Be a friendly person. That's going to stand you in good stead no matter what. Also, because if the only time you really go outside your comfort zone is to talk to this particular girl, you will find yourself paralyzed with fear and worry. You won't just have the jitters about talking to someone you like, you will also be shy and afraid because you have little to no practice doing this with anyone.
So! Say hi to people - male or female, young or old. Say good morning to the neighbor walking his dog and chat for a sentence or two with the grocery store checkout clerk about the weather. Teach yourself to be sociable.
When you have spent some time together (and don't ask me how long, but a month is certainly too long), ask her for a coffee or a soda. It's something small and noncommittal, and it's a bit ambiguous.
Let's say she says yes (because if she says no then you will definitely know where you stand), and you go. You have a lovely time. And because you are used to talking to people by this time, you will have some reserves in terms of things to talk about. Be pleasant. This is not the time for romance or to reveal deep feelings or anything of the sort.
When coffee or soda (keep this small and light - not the movies, which are too long; not dinner, because that's too much of a commitment; and not drinks even if you are both of age, because alcohol does odd things to people) is done, say something like,
"I had a really good time. Let's do this again, but make it a real date, okay? Say, Saturday night?"
Then she can either say yes, or she can claim she didn't know it was a date and she will (if she's a nice person) do her best to let you down easy.
I am suggesting this kind of ambiguous meeting because it's easier to take if she turns you down. It also gives her an out in case she doesn't feel the same way about you that you feel about her. Everybody is protected here.
Also, you pay for the coffee or soda, because you were the one making the invitation, okay?