wow.. Minnesota on January. Be prepared for dead cold winter. So, bring big coats, big jackets, hats, gloves etc. Remember that it could be -50 deg C outside but room temprature in apartment, colleges, groceries or anywhere indoor is well heated and you can't wear all those insulated clothes indoor.  And during winter you will be spending 99% of time indoors except geeting into parking from the building. So make your selection based on this too. And fashion here is different than Nepal. So, you may not like what you are used to in Nepal in few months.

The first few months or may be a year would be very harsh and bleak. So bring enough moneys so that you do not have to struggle from beginning while you are still getting used to society, culture, weather and overall system here. Once you are here try spending more times with friends, schools, spend much of your time on social activites in school and among friends. That would keep you little far from being home sick.