I got a girl's phone number. She lives in the same building. I'm wondering, if I ask her out, what can I set up? A cup of coffee, a dinner? I talked to her a few minutes and I gave her a good first impression. She thought I was sweet. My concern is, if I go out with her for a long time, for example 30 or even longer, I don't think I can maintain my sweetness/humor. Then she will be disappointed in me and find I'm not as sweet or humorous as she previously thought. Also, if I set up a coffee talk, she and I may walk together to the coffee shop, do you think it is kind of unnatural? What are your thoughts?