There is a girl at my church I'd like to pursue a relationship with. Any advice?

I'm a college student, and i hang at my churches student center very frequently. I met a girl this year there and we are friends. We talk when we see each other. we shared numbers, and we text a little, and we're both Catholic.

I'd like to ask her to get ice cream on campus and go for a short walk as a first date.
How can I best ensure she says yes?
How do I treat her before asking?
How should i ask her
There is a girl at my church I'd like to pursue a relationship with. Any advice?
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