What do I need to do and go for a marriage license?

My boyfriend and I want to get married in April of '09. But I don't know what all is needed for a license, or where to go to. He lives in Arkansas and I live in Texas. Both same city, but on different sides of the state line. We also want to get married there at the courthouse, but don't know what all is needed to set that up. I'm so lost! I don't know where to start. Do anyone have any information that can help me out?