No worries. Coming to BYU is easy. You should attend New Student Orientation. Here's a schedule of how that goes.
They'll take care of all of that for you and make it easy and fun. The rest really depends on you. If you've never lived away from home before it would be a good time to ask some basic questions:
1) Can you clean?
2) Can you cook? (only really applies if you are in off campus housing)
3) Can you do laundry? Ironing?
4) If you were left in the woods and three giant panda bears were surrounding you in an equilateral triangle and one of them was wounded at which angle would you run to survive the longest?
5) Have you browsed over BYU's site?
6) Is there anyone out here you know?
7) Do you have health insurance? They'll be able to access your records. You don't need to carry them around.
Now, the boy issue. You say you're "really good friends." It sounds like you ARE madly in love with him or at least you really really really like who he is. So... tell him something! Are you ok with looking back a year from now knowing you didn't do anything? What do you really have to lose? What's the worse that could happen? Doesn't seem like you really stand to lose much to me. You say you're "really good friends." Worse comes to worse: he runs away from you screaming like a deranged lunatic. See? If there were to happen at least you found out that he's CRAZY and you realize a relationship with a crazy person is just not going to work.
1) Tell him!
2) Be blunt and honest. I think life is just too short to beat around the bush. Will you ever see this guy again?
3) Tactful: you don't need to BURY him in reasons WHY you like him. A simple "hey -----, you know I really like you" in a sincere manner means a lot.
4) If you feel really bold, a dinner invitation would be awesome. I don't know a guy that would turn down a dinner date, it's not overly-forceful, and it gives him a chance to consider things a little more. My seminary teacher claims that she got noticed by her now-husband for the chocolate chip cookies she made him when he was sick. I believe it. Quickest way to a man's heart is the stomach (to my beautiful girlfriend: * hint hint * :P, to my beautiful girlfriend's mother: you're amazing... those peanut butter cookies.. wow. I owe you big time.)
I can only guarantee you one thing: if he's a friend of yours and you nicely tell him how you feel, no matter what, he'll be flattered. It might take him a while to realize this but I've never met anyone who, even when they're not interested, isn't slightly delighted or their heart skips a beat when they realize a member of the opposite sex finds them charming, attractive, and fun to be around.
-Castle in the Sky