Most Helpful Girl
Where do you know this girl from? You can always talk about things from the place you met at. Also ask her some questions about herself like do you go to school? What's your major? Do you work? Etc. Then after talking for a little while, get her number! Conversation isn't hard if you start with the basics, and then build off what you know of her and her interests. If you find things in common, that's great. How much have you talked to her so far?
By the way, I'm from NM too!