I'm going to ask a girl out.
I'm curious as what makes you want to ask her out?
I like her and I want to be in a relationship with her. She's everything that I need in a person.
It's fine to ask someone out that you like. Keep in mind the possibility of rejection and how you will handle the situation if the answer if no.
I'll ask her in Starbucks and then I'm going to get her number.
I'm glad that you're going to take the chance on asking her out. I am sure that things will go well, but if they don't then I am always here to talk to you about it.