Currently in one for a year, another year to go before she moves back and I took some advice from Gaf in the dating thread a bit back. We're still going as strong as ever.
Some advice I can give.
1. Plan times to talk, dates, etc. Use a bit of everything. Facebook helps, facebook stalking doesn't. Sometimes I post something on her wall, send messages daily, we do the pokes. We also use a phone App called Couple and have Skype session. All of this is used.
2. You need to make plans and commitments too. I'm spending 1.8k to visit her this winter and to go on a small vacation with her. She is spending some 1k to come back this summer to visit me. I've already planned out an event or two with friends such as a beach day.
You're saying its a lot. Yes it is. I don't spend much money anymore so I can save for these things. I stopped eating out, going to movies weekly, buying as many games, etc.
3. You need to have your own life too. Not hobbies. Not friends. But goals you are working too. This is something people misunderstand. Hobbies and friends do not replace your own desires and motivations. You need something else you are working on to achieve. Be it school, work, etc. Something that is important to you and with no real basis to her.
4. End game, what is the goal? If the goal is not living together in the end. Quit now.
5. See each other once every 6 months at least.
6. Send letters, packages, postcards, etc. Little stuff. I send funny videos, new articles, and other things online too. It isn't just ask her how her day is... some times it's me just sending dick pics or stupid videos of myself.
Now you want to know the positives to it?
1. You will have a lot of free time. It's actually relaxing to be honest. No obligations outside of talk times. If you are self motivated, it does something for you. It allows you to really work on yourself. For me, I started to workout again, learn a new language, actually decide to finish up school, etc. I have the time now. She is doing her thing, I'm doing mine.
2. The first few months were bad, it's only gotten easier. I miss her like hell... but a lot of those little trust issues, doubts, and everything slowly went away. On both our sides. I still have my doubts, but I've probably grown more in this year than most do in a decade.
3. Guess what, long distance relationships are the same as every other one. They have the same chance to succeed as any relationship. What does that mean to you? If the problem is there, it will manifest. It's all going to be the same on how you handle it and if you two truly do want to be together. There is no reason one would fail just because it is a long distance.