i suggest you look for opportunity to make ur SSN as soon as u get here. Look for on campus jobs that will help u get one. Once thats done, work towards making a good credit history. get a small credit/secured line and be prompt on payments for next 6-12 months then go ahead an apply for a bigger card.

if u have the money, get a driver's licence asap and look into buying a cheap car (like a $3000 toyota corolla) which will get u thru a lot of unnecessary tensions. at the same time invest in a decent spec laptop (dell is a good company). 

If you know of anyone here (friend or relative) try to get into their cell phone plan (tmobile is a decent carrier)

make lots of friends both nepali and non-nepali. just dont stick exclusively with nepali crowd. dont be afraid to try out new things. it only comes once :)

all the while that you are having fun partying, road-trippin, smoking, "bird watching & hunting" always keep your priorities at the back of your head, and never forget where you come from, or where you are headed.

its exciting times for you, once again congratulations, and welcome.