Long distance relationship help please?

I got with this girl at a graduation party. She lives about a half hour drive away. The only way to communicate with her is house phone. I have been going out with her for four days so far. I am uncertain when i will see her in person again. I need to find a way to communicate with her, she has no internet or cell phone or anything like that. Is snail mail ok? All I want is to find a way to plan communication and to plan outings like hanging out or mall and movies or whatever. I am 19, I just graduated high school. going to get my drivers license in a few weeks, about to have a job. Basically, I want to find a way to communicate mutually and to plan things out so we can hang out and such.