-Communication communication communication. 당신 need to talk about everything, and i mean everything.
-If something is bothering you, 당신 cannot expect them to know, because of the distance. So 당신 need to be able to talk to them. Tell them 당신 are upset. With the distance, 당신 cannot behave like 당신 would in a local relationship, 당신 cannot be upset and expect them to know. Sometimes it is obvious, but even then, it is good habit to be straight forward: “I am a little upset right now. X, Y, and Z happened and I am not happy with it”.
-You do not need to tell them what 당신 are doing every 분 of everyday. But its important to talk about big events. Let them know when you're going somewhere (like out of the state/far away from home). Let them know if you're going to be unable to talk to them for a while/couple hours, so they are not worried when 당신 do not text back at the usual time frame.
-Talk about money. Talk about how you're going to visit/afford visiting. Talk about who is visiting who, and when. Talk about the future so 당신 know when (about when) the 다음 visit will happen. Money is extra important in an LDR. You...